The struggle between organisms to survive as they attempt to use the same limited resource.

All the members of one species in a particular area.

The nonliving parts of an ecosystem.

A symbiotic relationship in which both species benefit.

The largest population that an environment can support.

The community of organisms that live in an area, along with their nonliving surroundings.

A group of organisms that are physically similar and can reproduce with each other to produce fertile offspring.

Environmental conditions that prevent populations from increasing.

A symbiotic relationship in which one species benefits and the other species is neither helped nor harmed.

All the different populations that live together in an area.

The living parts of an ecosystem.

Behaviors and physical characteristics of species that allow them to live successfully in their environment.

An interaction in which one organism kills and eats another organism.

If a population is very large or spread out, ecologists use the ____ method to estimate the population size.

All the different species living in an area form a ______.

An organism's specific role in its habitat is called its ____.

Every organism has a variety of ____ that enable it to live successfully in its environment.

Water, sunlight, and oxygen are examples of ____ factors in ecosystems.

Students counted 75 sand crabs in a 5-meter by 3-meter section of a beach. What was the population density of sand crabs in that section?

The entire beach measures 60 meters by 30 meters. Estimate the total population of sand crabs on the entire beach.

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