What is the term scientists use to describe how reproductively successful an organism is in its environment?

"Everything an organism does and when it does it" describes an organism's

Which of the following is an interaction in which one organism benefits and the other is harmed (+/-)?

Which of the following is an interaction in which both organisms are harmed (-/-)?

Which of the following types of organisms perform photosynthesis?

Which of the following organisms is a decomposer?

A caterpillar eats some grass. A bird eats a caterpillar. A fox eats a bird. Which of the following food chains represents this series of feeding relationships?

A trait that is passed to the next generations and promotes an individual's survival and reproduction is called an adaptation.

Mass extinctions occur gradually, one species at a time.

Competition describes an interaction in which both organisms benefit.

Photosynthesis is the process by which primary producers use sunlight to convert oxygen and water into sugars.

The organism in the diagram is a primary consumer.

If these are present in a new environment, a species is unlikely to become invasive.

In Madagascar, several species of lemur eat bamboo, but each species specializes in one part of the bamboo—one species eats mature bamboo stalks, one species eats bamboo shoots, and one species eats leaves. This is an example of

In the example above, one lemur species eats only bamboo shoots. Bamboo shoots contain a high level of cyanide, a toxic chemical. This lemur species has developed a tolerance for a certain amount of cyanide. What do you think will happen over time?

When energy is transferred between trophic levels, the amount of available energy lost is about

Humans are generally

Any being that uses the sun's energy to create sugars is a

Which best describes evolutionary success?

Around 65 million years ago, 95 percent of the planet's species were wiped out, and the age of the dinosaurs ended. Which of the following best explains why we still have numerous species today?

An invasive species is a species that has been introduced to a new area and lacks limiting factors.

On islands off the coast of Siberia, paleontologists have found the remains of pygmy mammoths. These populations were likely separated from mainland mammoth populations and became a new type of mammoth through allopatric adaptation.

An organism that depends on another without killing it is a predator.

A nation where most of the people eat a primarily vegetarian diet will be able to support a lower population than it would if the people ate a lot of meat.

In a woodland, a rabbit eats grass, and a coyote eats the rabbit. The coyote is a secondary consumer.

You visit the state fair and see a display of 17 breeds of chicken. These chickens are the result of

When the environment changes too quickly for an organism to adapt, what will occur?

Two species of finch live in the same environment. Over time, one develops a larger beak to consume larger seeds, while the other develops a narrow beak to consume more delicate seeds. This is an example of

An interaction in which an individual of one species kills and consumes an individual of another is called

In the western United States, at the southern edge of their range, moose are sometimes so severely infested with ticks that they die. The tick/moose relationship is best described as

A beehive depends on pollen from flowers to survive. Flowers depend on bees to pollinate them. Humans tend bee hives, offering the bees a place to live in exchange for some of their honey. The relationship among these three sets of organisms is

The ultimate source of energy in an ecosystem in which deer eat grass and coyotes eat deer is

In a food web that consists of grass, mice, deer, coyotes, and hawks, which species is likely to have the greatest biomass?

A niche restricted by competition is a

In the history of the world, how many mass extinctions have occurred?

In a mass extinction, the rate of extinction exceeds

A deer feeding on a shrub is an example of

The first level of all food pyramids

A species with a restricted tolerance for environmental conditions is

Two populations of a deer species are separated when a glacier forms. After the glacier melts, the two populations have become different species. This is an example of allopatric selection.

Communities that are powered by the sun depend on chemosynthesis for their energy.

A food web cascade occurs when one species has an indirect effect on species at a different level of the energy pyramid.

Animals gathering around a water hole in a drought-prone area and establishing hierarchies of access to the water is an example of competition.

You have many species of bacteria living in your gut that help you with digestion. This relationship is best defined as commensalism.