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Chapter 1 Honors Textbook ppt
Chapter 1 Honors Textbook ppt

... Levels of Organization • Some forms of life consist of single cells • In multicellular forms cells combine to form tissues • Tissues combine to form organs, which can be united as organ systems • Multicellular organisms are composed of multiple organ systems ...
Kingdom Animalia
Kingdom Animalia

... C. Coelomate: fluid filled space between body wall and digestive tract, protects organs during movement • Example: earthworm, human ...
AP Exam Additional Content Information
AP Exam Additional Content Information

... photosynthetic; eat and grow as a single celled mass called a Notice they all plasmodium; the mass ingests food by phagocytosis end in -mycota  Acrasiomycota = called cellular slime molds; when there is a lot of food, they eat individually; when food is scarce, they clump together as one and work a ...
biology flashcards
biology flashcards

... supported by the resources in an ecosystem is a limiting organization ...
Biology Flashcards
Biology Flashcards

... supported by the resources in an ecosystem is a limiting organization ...
Biology Flashcards
Biology Flashcards

... supported by the resources in an ecosystem is a limiting organization ...
Evolution: Evidence of Change
Evolution: Evidence of Change

... • Estimates are about 10 million species exist today • Estimates are that 99.9% of all species that have ever lived on earth are extinct! ...
1 Evolution, Variation, and Adaptation
1 Evolution, Variation, and Adaptation

... -not all young produced in each generation survive -individuals that survive and reproduce are those with favorable variations = survival of the fittest -survival of the fittest-organisms that inherit the “best” traits are the ones that survive -they may pass their “good” genes on to the next genera ...
1 Evolution, Variation, and Adaptation
1 Evolution, Variation, and Adaptation

... -not all young produced in each generation survive -individuals that survive and reproduce are those with favorable variations = survival of the fittest -survival of the fittest-organisms that inherit the “best” traits are the ones that survive -they may pass their “good” genes on to the next genera ...
Chapter 7 Study Guide
Chapter 7 Study Guide

... e) Spongin may be the only means of support, or it may be found together with spicules. They are mostly found between the outer and inner layers of cells. (1) Most have spicules, transparent siliceous or calcareous supporting structures of different shapes and sizes. (2) Many also have a skeleton of ...
379579ch_7_Div_Vari
379579ch_7_Div_Vari

... •Jackrabbits living in the desert have long ears that provide a large surface area for giving off heat •Dandelion seeds are carried on the wind which allow dandelions to spread over large areas •Each habitat has a variety of organisms that live there in different ways. This variety of life is called ...
Chapter 28 PowerPoint
Chapter 28 PowerPoint

... – Between inner and outer layers of sponge body ...
Review questions for Exam #3
Review questions for Exam #3

... Feeds on decomposing material Feeds on nutrients and plankton suspended in the water column Feeds by using symbiotic autotrophic algae What is spongin? What feature can distinguish a coelomate animal from a pseudocoelomate? A body cavity Bilateral symmetry A body cavity which is completely lined wit ...
Kingdom Animalia
Kingdom Animalia

... amoebocytes, which are capable of amoeboid ...
Pond Diversity
Pond Diversity

... chitin, with calcium carbonate • Feathery gills ...
Click here for printer-friendly sample test questions
Click here for printer-friendly sample test questions

... The function of the circulatory system is to transport oxygen to every cell in the body, to transport wastes for elimination from the body, and to move white blood cells around the body to attack pathogens. Heart – a muscle that pumps blood throughout the body Arteries – vessels that carry blood awa ...
Chapter 1 Active Reading Guide Introduction: Themes in the Study
Chapter 1 Active Reading Guide Introduction: Themes in the Study

... you will come back to these ideas, so don’t fret if some of the concepts presented are unfamiliar. However, to guide your study, define each of the terms in bold as you come to them. ...
General Biology Review
General Biology Review

...  Evolution is a change in a species over time  The theory of evolution was stated by Charles Darwin and is based on natural selection  Natural selection states that organisms with traits well suited to an environment are more likely to survive and produce more offspring than organisms without the ...
The BIG Picture (Biology SOL Review)
The BIG Picture (Biology SOL Review)

...  Evolution is a change in a species over time  The theory of evolution was stated by Charles Darwin and is based on natural selection  Natural selection states that organisms with traits well suited to an environment are more likely to survive and produce more offspring than organisms without the ...
Unifying Themes of Biology
Unifying Themes of Biology

... certain characteristics, but an actual definition of life is not simple. Why? The categories of living and nonliving are constructed by humans, and they are not perfect. For example, viruses fall into a middle range between living and nonliving. They show some, but not all, of the characteristics of ...
Wizard Test Maker
Wizard Test Maker

... in the oldest rocks. (2) The simplest fossil organisms appeared only in the newest rocks. (3) The same kind of fossil organisms appeared in old and new rocks. (4) No fossil organisms of any kind appeared in the newest rocks. ...
The Animal Kingdom PowerPoint
The Animal Kingdom PowerPoint

...  Simplest animals.  Porifera means “pore-bearer” in Latin.  Bodies covered with pores and are made ...
Comparing Invertebrates
Comparing Invertebrates

... Absorbed nutrients from surrounding water Some had photosynthetic algae living within their tissues Segmented Bilateral symmetry Little cell/internal specialization Little organization back to front May have been related to jellyfish and worms but body plan distinct from anything living today ...
Levels of Organization - Flipped Out Science with Mrs. Thomas!
Levels of Organization - Flipped Out Science with Mrs. Thomas!

... group of organs that work together to perform a major function. For example, your heart is part of your circulatory system, which carries oxygen and other materials throughout your body. Besides the heart, blood vessels are organs that work in your circulatory system. ...
Ch 1 notes - HensonsBiologyPage
Ch 1 notes - HensonsBiologyPage

... Golf Scores ...
< 1 ... 37 38 39 40 41 42 43 44 45 ... 99 >

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.
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