Exam 4: Biodiversity and Evolution

Which statement best describes an organism's habitat?​

When environmental conditions change dramatically or rapidly,a population of a species faces three possible futures: adapt to the new conditions through natural selection,migrate (if possible)to another area with more favorable conditions,or ____.​

In a population of wild bees, a mutation resulted in slightly larger wingspan in some of the bees. This larger wingspan made the bees more efficient in their flights to flowers to collect nectar. Thus, these bees became more successful. This trait was passed on to offspring, and eventually the larger wingspan variety of bee replaced their smaller-winged relatives completely. -Because this mutation produced a specific wing trait that was passed onto offspring,the mutation must have occurred ____.​

​A species that is found only on one island would be described as ____.

The ability of one or more organisms in a population to tolerate a chemical such as a pesticide or antibiotic designed to kill it and to reproduce more rapidly than the members of the population that do not have such genetic traits is called ____.​

A trait that creates a specific advantage for some organisms in the struggle to survive ____.​

​How does artificial selection differ from natural selection?

____ are species whose roles have a large effect on the types and abundance of other species in an ecosystem.​

In a process called ____________________,one species splits into two of more different species.

Genes mutate,____________________ are selected,and populations____________________.

The American alligator is a(n)____ because it plays a number of important roles in the ecosystems where it is found in the southeastern United States.​

Match the type of diversity with the proper choice below. -Some tropical forests contain thousands of producer species.​

We can say that on a long-term basis,the ____ principle of sustainability has especially helped life on the earth to adapt to drastic changes in environmental conditions.​

​The biological diversity of the earth is only a function of the number of species on the earth.

Sharks are especially vulnerable to population declines because ____.​

Match the type of diversity with the proper choice below. -Coastal states in the United States typically have more ecosystems than land-locked states.​

____________________ are changes in the DNA molecules of a gene in any cell that can be inherited by offspring.​

Species that provide early warnings of environmental change in a community or an ecosystem are called ____.​

A(n)____________________ includes an organism's range of tolerance for physical and chemical conditions.​

____ is the number and variety of species present in any biological community.​