body_system_relationships_chart
... Circulatory System- Brings oxygen, hormones and nutrients to cells; fights infection; removes cell waste; helps regulate body temperature ...
... Circulatory System- Brings oxygen, hormones and nutrients to cells; fights infection; removes cell waste; helps regulate body temperature ...
What is an animal? Part 2
... Early Animals and the Cambrian Explosion • Animals probably evolved from a colonial protist that lived in the Precambrian seas Digestive cavity ...
... Early Animals and the Cambrian Explosion • Animals probably evolved from a colonial protist that lived in the Precambrian seas Digestive cavity ...
BCH 450 CAT 1 lectures
... Structure of collagen (Amino acid sequence Collagen is rich in proline and glycine, both of which are important in the formation of the triple-stranded helix. Proline facilitates the formation of the helical conformation of each α chain because its ring structure causes “kinks” in the peptide chain ...
... Structure of collagen (Amino acid sequence Collagen is rich in proline and glycine, both of which are important in the formation of the triple-stranded helix. Proline facilitates the formation of the helical conformation of each α chain because its ring structure causes “kinks” in the peptide chain ...
Invertebrate Animals
... are more complex than flatworms because their digestive tract has two openings. Food enters through the mouth, is digested in a digestive tract, and wastes exit through the anus. Roundworms are a diverse group. Some roundworms are decomposers, others are predators, and some, like the heartworm, are ...
... are more complex than flatworms because their digestive tract has two openings. Food enters through the mouth, is digested in a digestive tract, and wastes exit through the anus. Roundworms are a diverse group. Some roundworms are decomposers, others are predators, and some, like the heartworm, are ...
AQA Level 1/2 Certificate in Biology Specification Specification
... through teaching of the content. This specification has less focus on some of the aspects of How Science Works that are covered in GCSE Biology (for example, there is less sociological, economic and environmental content). This gives time for more detailed study of scientific knowledge and for devel ...
... through teaching of the content. This specification has less focus on some of the aspects of How Science Works that are covered in GCSE Biology (for example, there is less sociological, economic and environmental content). This gives time for more detailed study of scientific knowledge and for devel ...
Invertebrate Unit (Ch. 26, 27, 28, 29)
... organisms that do not move (as adults). No symmetry (asymmetry) Sponges lack special tissues and organs. They have special structures that allow water to pump through their body which help the sponge to respire and filter food and ...
... organisms that do not move (as adults). No symmetry (asymmetry) Sponges lack special tissues and organs. They have special structures that allow water to pump through their body which help the sponge to respire and filter food and ...
Unit 1 - West Windsor-Plainsboro Regional School District
... ● All cells contain genetic information in the form of DNA molecules. Genes are regions in the DNA that contain the instructions that code for the formation of proteins, which carry out most of the work of cells.(HS-LS1-1) ● Multicellular organisms have a hierarchical structural organization, in whi ...
... ● All cells contain genetic information in the form of DNA molecules. Genes are regions in the DNA that contain the instructions that code for the formation of proteins, which carry out most of the work of cells.(HS-LS1-1) ● Multicellular organisms have a hierarchical structural organization, in whi ...
Phylum Echinodermata
... • Echinoderms first evolved from a single-celled organism • Popular Belief that Echinoderms evolved from ancestors which lived in the Pre-Cambrian and Cambrian Periods – Supported by a fossils paleontologists found that they believe was a pre-echinoderm ancestor in the PreCambrian period – Other ech ...
... • Echinoderms first evolved from a single-celled organism • Popular Belief that Echinoderms evolved from ancestors which lived in the Pre-Cambrian and Cambrian Periods – Supported by a fossils paleontologists found that they believe was a pre-echinoderm ancestor in the PreCambrian period – Other ech ...
Chapter 1: An introduction to Life on Earth
... Some inherited mutations help individuals survive and reproduce – Natural selection is the process by which organisms with certain inherited traits survive and reproduce better than others in a particular environment – Organisms that best meet environmental challenges leave the most offspring – Na ...
... Some inherited mutations help individuals survive and reproduce – Natural selection is the process by which organisms with certain inherited traits survive and reproduce better than others in a particular environment – Organisms that best meet environmental challenges leave the most offspring – Na ...
Cnidarians (Phylum Cnidaria)
... Nervous and Respiratory Systems • Though cnidarians lack a brain or true nerves, they do have specialized nerve cells. These cells interconnect to form a nerve net that transmits impulses in all directions. This simple nervous system can produce some relatively ...
... Nervous and Respiratory Systems • Though cnidarians lack a brain or true nerves, they do have specialized nerve cells. These cells interconnect to form a nerve net that transmits impulses in all directions. This simple nervous system can produce some relatively ...
Chapter 19: Invertebrates
... Coelomates = have a true coelom that houses digestive tract and organs, like annelids (earthworm) ...
... Coelomates = have a true coelom that houses digestive tract and organs, like annelids (earthworm) ...
Circulatory system
... • Possess a nervous system of a simple brain (ganglion) and ventral nerve chord; eyespots capable of detecting light • No organized respiratory, circulatory or excretory system; diffusion at the cellular level ...
... • Possess a nervous system of a simple brain (ganglion) and ventral nerve chord; eyespots capable of detecting light • No organized respiratory, circulatory or excretory system; diffusion at the cellular level ...
Cambrian “Explosion,”
... The procedure of classifying organisms is called taxonomy, and the general name for individual groups is “taxa.” The rst question that needs to be addressed is “What is a phylum?” A phylum is often identied as a group of organisms sharing a basic “body plan” or a group united by a common org ...
... The procedure of classifying organisms is called taxonomy, and the general name for individual groups is “taxa.” The rst question that needs to be addressed is “What is a phylum?” A phylum is often identied as a group of organisms sharing a basic “body plan” or a group united by a common org ...
Respiratory System
... Volvox: These simple organisms can also depend on diffusion alone to meet their gas exchange requirements. ...
... Volvox: These simple organisms can also depend on diffusion alone to meet their gas exchange requirements. ...
Some Characteristics of the Phylum Cnidaria
... may consist of organic material such as chitin. Polyps also have a hydrostatic skeleton, where the muscles in the endoderm work against the fluid contained in the coelenteron, thus extending the polyps. Hydrostatic skeletons are also present in the tentacles, allowing them to be extended to capture ...
... may consist of organic material such as chitin. Polyps also have a hydrostatic skeleton, where the muscles in the endoderm work against the fluid contained in the coelenteron, thus extending the polyps. Hydrostatic skeletons are also present in the tentacles, allowing them to be extended to capture ...
The Fossil Record of the Cambrian “Explosion”: Resolving the Tree
... Until the early 1990s, the age of the PrecambrianCambrian boundary was not tightly constrained, and was estimated to be about 575 million years ago. However, in 1993, new radiometric dates from close to the accepted Precambrian-Cambrian boundary revealed that it was significantly younger—about 544 m ...
... Until the early 1990s, the age of the PrecambrianCambrian boundary was not tightly constrained, and was estimated to be about 575 million years ago. However, in 1993, new radiometric dates from close to the accepted Precambrian-Cambrian boundary revealed that it was significantly younger—about 544 m ...
Lesson Overview
... Other fossils from this time period have been tentatively identified as parts of sponges and animals similar to jellyfish. Paleontologists have also identified what are called “trace fossils,” tracks and burrows made by animals whose body parts weren’t fossilized. ...
... Other fossils from this time period have been tentatively identified as parts of sponges and animals similar to jellyfish. Paleontologists have also identified what are called “trace fossils,” tracks and burrows made by animals whose body parts weren’t fossilized. ...
Respiration in Organisms
... Close your nostrils and mouth tightly and look at a watch. What did you feel after some time? How long were you able to keep both of them closed? Note down the time for which you could hold your breath (Fig. 10.2). So, now you know that you cannot survive for long without breathing. Breathing means ...
... Close your nostrils and mouth tightly and look at a watch. What did you feel after some time? How long were you able to keep both of them closed? Note down the time for which you could hold your breath (Fig. 10.2). So, now you know that you cannot survive for long without breathing. Breathing means ...
IN-DEPTH FILM GUIDE
... deliberate searching. Explain that paleontologists do not accidentally stumble upon the fossils they discover, but that paleontology is a process of hypothesis testing. Through careful planning, reading scientific articles, and studying geology and geological time, paleontologists form hypotheses ...
... deliberate searching. Explain that paleontologists do not accidentally stumble upon the fossils they discover, but that paleontology is a process of hypothesis testing. Through careful planning, reading scientific articles, and studying geology and geological time, paleontologists form hypotheses ...
Flatworms Quiz - cloudfront.net
... c) Flatworms have an incomplete digestive system, with just one opening. d) Flatworms do not have a digestive system. ...
... c) Flatworms have an incomplete digestive system, with just one opening. d) Flatworms do not have a digestive system. ...
Invertebrate Animals CH 4
... mouthlike opening that leads into a gut. You can see from the diagram of the jellyfish life cycle on page 420 that both the polyp and medusa have radial symmetry. A radial body plan allows a sessile organism, such as the sea anenome shown in the photograph above, to capture food from any direction. ...
... mouthlike opening that leads into a gut. You can see from the diagram of the jellyfish life cycle on page 420 that both the polyp and medusa have radial symmetry. A radial body plan allows a sessile organism, such as the sea anenome shown in the photograph above, to capture food from any direction. ...
Animal_phyla
... Their bodies are porous. They are filter feeders; water flows in through many small openings, and out through fewer, large openings. They have inner and outer cell layers, and a variable middle layer. The middle layer often is gelatinous with spiny skeletal elements (called spicules) of silica or ca ...
... Their bodies are porous. They are filter feeders; water flows in through many small openings, and out through fewer, large openings. They have inner and outer cell layers, and a variable middle layer. The middle layer often is gelatinous with spiny skeletal elements (called spicules) of silica or ca ...
Chapter 14: Invertebrate Animals
... drawn down the center of their bodies to divide them into two similar parts. Grasshoppers, lobsters, like the one in Figure 2, and humans are bilaterally symmetrical. Some animals have an irregular shape. They are called asymmetrical (AY suh meh trih kul). They have bodies that cannot be divided int ...
... drawn down the center of their bodies to divide them into two similar parts. Grasshoppers, lobsters, like the one in Figure 2, and humans are bilaterally symmetrical. Some animals have an irregular shape. They are called asymmetrical (AY suh meh trih kul). They have bodies that cannot be divided int ...
Precambrian body plans
Until the late 1950’s, the Precambrian era was not believed to have hosted multicellular organisms. However, with radiometric dating techniques, it has been found that fossils initially found in the Ediacara Hills in Southern Australia date back to the late Precambrian era. These fossils are body impressions of organisms shaped like disks, fronds and some with ribbon patterns that were most likely tentacles.These are the earliest multicellular organisms in Earth’s history, despite the fact that unicellularity had been around for a long time before that. The requirements for multicellularity were embedded in the genes of some of these cells, specifically choanoflagellates. These are thought to be the precursors for all multicellular organisms. They are highly related to sponges (Porifera), which are the simplest multicellular organisms.In order to understand the transition to multicellularity during the Precambrian, it is important to look at the requirements for multicellularity—both biological and environmental.