Exam 4: Biodiversity and Evolution

Species that migrate into,or that are deliberately or accidentally introduced into,an ecosystem are called ____________________.

Under certain circumstances,natural selection can lead to an entirely new species.a process called ____.

Changes in the DNA molecules of a gene in any cell that can be inherited by offspring are called ____.

What is the ability of one or more organisms in a population to tolerate a chemical designed to kill it,such as when bacteria tolerate antibiotics?

The fossils found so far probably represent about 50% of the species that have ever lived.

Briefly explain how natural selection has worked,and is working to change populations over time.

Long-term climate changes determine where plant and animal species can survive.

Use the figure above to answer the following question(s). -What advantage does the characteristic indicated by letter D bestow upon the animal who occupies this niche,as opposed to the animal occupying the other niche?

Many of the world's amphibian species are adapting rapidly to the environmental changes that are taking place in their habitats,which have been caused by human activities during the past few decades.

Endemic species are particularly vulnerable to extinction.