Exam 4: Biodiversity and Evolution

According to the International Union for Conservation of Nature (IUCN), about ____% of all known amphibian species are threatened with extinction.

Use the figure above to answer the following question(s). Which of the two animals, the panda or the raccoon, is considered a generalist? Why?

Species that are only found in one area are called _______________ and are especially vulnerable to extinction.

According to some scientists, the more diverse an ecosystem is, the ____ it will be.

According to the International Union for Conservation of Nature, more than ____ percent of all known amphibian species are declining in numbers.

The loss of a(n)____________________ species can lead to population crashes and extinctions of other species in a community that depend on it.

The diversity that enables life on the earth to adapt and survive environmental changes is called ____.

The number of species on the planet at any time is a result of the interaction between the processes of ____________________ and ____________________.

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

The variety of terrestrial and aquatic ecosystems found in an area or on the earth is called ____.

Estimates indicate the average annual background extinction rate is one species lost for each million species on earth per year.

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.

Genetic variability in a population is the result of ____________________.

A(n)____________________ is a significant increase in extinction rates above the background level.

From a scientific point of view, which of the following is true ?

What does region E represent?

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?

Research performed by Edward O. Wilson on ____ has been applied to the study and understanding of other social organisms, including humans.

Non-native species can spread rapidly if they find a new location with favorable conditions, often because they do not face the same ____ that they face in their native niches.

In speciation, two species interbreed to form one new species.