1.3 Interactions Among Living Things

The behaviors and physical characteristics of species that allow them to live successfully in their environment are called

• habitats.
• biotic factors.
• limiting factors.
• adaptations.

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The struggle between organisms to survive in a habitat with limited resources is called

• symbiosis.
• competition.
• predation.
• parasitism.

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When a jellyfish paralyzes a tiny fish with its poisonous tentacles, the fish is the

• parasite.
• prey.
• predator.
• host.

A close relationship between two species that benefits at least one of the species is called

• competition.
• symbiosis.
• adaptation.
• natural selection.

When a flea is living on a dog, the dog is the

• host.
• parasite.
• predator.
• prey.

Mutualism, commensalism, and parasitism are the three types of

• competition.
• symbiotic relationships.
• prey adaptations.
• predation.

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A hawk building its nest on an arm of a saguaro cactus is an example of

• commensalism.
• mutualism.
• parasitism.
• predation.

A tapeworm living inside a wolf's body is a 

• predator.
• host.
• parasite.
• prey.

Both species benefit in the type of symbiosis called 

• mutualism.
• commensalism.
• parasitism.
• competition.

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An organism's particular role in its habitat, or how it makes its living, is called its

• carrying capacity.
• competition.
• ecosystem.
• niche.