Exam 39: Biodiversity and People

Functioning ecosystems provide a variety of benefits called ecosystem services to humans; examples include

Biodiversity and ecosystem stability are directly proportional to one another.

Although maintaining biodiversity faces many challenges, at this present time the most serious threat comes from

Nonnative species are also called _________ species.

Maintaining biodiversity is critically important because when biodiversity declines,

In the photo below, the person is crushing aluminum cans. What best explains the benefit of the action depicted?

The total number of _______ presently identified, named, and taxonomically categorized is approximately 1.5 million.

Of the species humans have catalogued, most are

The biggest threat to biodiversity is

Which of the following changes could be expected if global warming continues at its present pace?

Without places to live, Earth's biodiversity will continue to decline. In what ways does human activity contribute to habitat loss?

An ecosystem is made up of _______ and the organisms that live in them.

Nonhuman species are

Past extinctions often removed the most dominant species, so the eventual extinction of humans is not inconceivable. What action would have the highest probability of forestalling our own extinction?

The canopy of the rainforest is the habitat located at the tops of the trees. One of the most amazing discoveries about canopy biodiversity was that

The arrival and colonization by _______ would produce the greatest potential threat to an area's biodiversity.

Prairies that have high biodiversity are

Biologists have spent the past 200 years identifying and classifying Earth's biodiversity; at this present time

Recycling is one human activity that can help maintain biodiversity.

Many biologists believe that a mass extinction in currently in progress, but can be prevented by responsible human intervention.