Biol
... experiments, Darwin's Finch (on the Galapagos Islands), Darwin's 2 major ideas (variation, offspring survival), microevolution, macroevolution, speciation, adaptive radiation, allopatric speciation, sympatric speciation, genetic isolation Origin of Life/Paleontology (Handouts) origin of life, Miller ...
... experiments, Darwin's Finch (on the Galapagos Islands), Darwin's 2 major ideas (variation, offspring survival), microevolution, macroevolution, speciation, adaptive radiation, allopatric speciation, sympatric speciation, genetic isolation Origin of Life/Paleontology (Handouts) origin of life, Miller ...
Slide 1
... 14.3 Life History • The Cenozoic era began 65 mya and is still going on. • Cenozoic means “recent life.” • Fossils from the Cenozoic era are closest to Earth’s surface, making them easier to find. ...
... 14.3 Life History • The Cenozoic era began 65 mya and is still going on. • Cenozoic means “recent life.” • Fossils from the Cenozoic era are closest to Earth’s surface, making them easier to find. ...
Chapter 17:
... Young earth struck by an object (another planet?) Heat melted the earth- all elements rearranged Settled by density (core, crust, atmosphere) ...
... Young earth struck by an object (another planet?) Heat melted the earth- all elements rearranged Settled by density (core, crust, atmosphere) ...
The Extinction of Darwinism
... Because of this logic Darwin insisted that Cuvier's theory of periodic catastrophes had been thoroughly discredited, and that, on the contrary, "there is reason to believe that the complete extinction of the species of a group is generally a slower process than their production." That judgment was b ...
... Because of this logic Darwin insisted that Cuvier's theory of periodic catastrophes had been thoroughly discredited, and that, on the contrary, "there is reason to believe that the complete extinction of the species of a group is generally a slower process than their production." That judgment was b ...
Chapter 5 Outline APES
... In a Darwinian world, the biggest survive. True fact about evolution is that the key to survival in a Darwinian world is coexistence through occupying different niches. ...
... In a Darwinian world, the biggest survive. True fact about evolution is that the key to survival in a Darwinian world is coexistence through occupying different niches. ...
HB Unit 11 History of Life and Classification
... • Biodiversity results from the interaction between speciation and extinction. ...
... • Biodiversity results from the interaction between speciation and extinction. ...
species selection
... In a population of skunks, some of the skunks are found to have an unusual variation, in that they smell sweet and pleasant instead of the usual terrible smelly defensive odor. A study finds that the new ‘Sweet’ mutation is a dominant allele, and also that 95% of the population is made up of normal ...
... In a population of skunks, some of the skunks are found to have an unusual variation, in that they smell sweet and pleasant instead of the usual terrible smelly defensive odor. A study finds that the new ‘Sweet’ mutation is a dominant allele, and also that 95% of the population is made up of normal ...
Evolution - Zanichelli online per la scuola
... At the start of the Mesozoic era, the surviving organisms inhabited a relatively empty world. Triassic period Pangaea began to ...
... At the start of the Mesozoic era, the surviving organisms inhabited a relatively empty world. Triassic period Pangaea began to ...
Chapter 3 Study Guide
... 4. Identify and discuss the consequences of three human activities that have resulted in major changes to the nitrogen cycle. For each activity identified and discussed, suggest one strategy for lessening the impact of the human activity. 5. Identify and discuss the consequences of three human activ ...
... 4. Identify and discuss the consequences of three human activities that have resulted in major changes to the nitrogen cycle. For each activity identified and discussed, suggest one strategy for lessening the impact of the human activity. 5. Identify and discuss the consequences of three human activ ...
Patterns of Evolution
... radiation that allowed them to “rule” Earth for millions of years while mammals remained small and were relatively scarce Once the dinosaurs were out of the picture, the mammals went through an adaptive radiation ...
... radiation that allowed them to “rule” Earth for millions of years while mammals remained small and were relatively scarce Once the dinosaurs were out of the picture, the mammals went through an adaptive radiation ...
The Emergence of Complex Life
... - a metal common in meteorites but rare in the earth's crust - marks the boundary between Cretaceous and Tertiary rocks. The theory was put forward that a meteorite as large as 10 km in diameter collided with earth at a speed of 72,000 km/hr. This thin layer of iridium found around the world is thou ...
... - a metal common in meteorites but rare in the earth's crust - marks the boundary between Cretaceous and Tertiary rocks. The theory was put forward that a meteorite as large as 10 km in diameter collided with earth at a speed of 72,000 km/hr. This thin layer of iridium found around the world is thou ...
Macroevolution and Mass Extinction powerpoin
... – Tertiary Period- marine mammals, flowering plants and grasses, grazers, insects – Quaternary Period- ice ages, our early ancestors ...
... – Tertiary Period- marine mammals, flowering plants and grasses, grazers, insects – Quaternary Period- ice ages, our early ancestors ...
Lecture 11 - Hilde Schwartz
... Alroy, J. (2008), Dynamics of origination and extinction in the marine fossil record, Proceedings of the National Academy of Sciences of the United States of America 105 Suppl 1:11536–11542. Alvarez, W., Asaro, F. and Montanari, A. (1990,) Iridium Profile for 10 Million Years Across the Cretaceo ...
... Alroy, J. (2008), Dynamics of origination and extinction in the marine fossil record, Proceedings of the National Academy of Sciences of the United States of America 105 Suppl 1:11536–11542. Alvarez, W., Asaro, F. and Montanari, A. (1990,) Iridium Profile for 10 Million Years Across the Cretaceo ...
Slide 1
... Effect is to leave many habitats open for surviving species Often a burst of evolution follows mass extinctions ...
... Effect is to leave many habitats open for surviving species Often a burst of evolution follows mass extinctions ...
Extinction event
An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the amount of life on Earth. Such an event is identified by a sharp change in the diversity and abundance of multicellular organisms. It occurs when the rate of extinction increases with respect to the rate of speciation. Because the majority of diversity and biomass on Earth is microbial, and thus difficult to measure, recorded extinction events affect the easily observed, biologically complex component of the biosphere rather than the total diversity and abundance of life.Extinction occurs at an uneven rate. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine animals every million years.Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land organisms.The Great Oxygenation Event was probably the first major extinction event. Since the Cambrian explosion five further major mass extinctions have significantly exceeded the background extinction rate. The most recent and debatably best-known, the Cretaceous–Paleogene extinction event, which occurred approximately 66 million years ago (Ma), was a large-scale mass extinction of animal and plant species in a geologically short period of time. In addition to the five major mass extinctions, there are numerous minor ones as well and the ongoing mass-extinction caused by human activity is sometimes called the sixth extinction. Mass extinctions seem to be a Phanerozoic phenomenon, with extinction rates low before large complex organisms arose.Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty. These differences stem from the threshold chosen for describing an extinction event as ""major"", and the data chosen to measure past diversity.