Unit 8 Investigating Interactions in Living Systems

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

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

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

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

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

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

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

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

The bacteria that live in your intestine and help break down food are an example of which type of interaction?

• competition
• mutualism
• parasitism
• predation

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Which of the following describes an interaction in which one organism kills and eats another?

• competition
• symbiosis
• predation
• mutualism

Which of the following is an example of a predator adaptation?

• a porcupine's needles
• a shark's powerful jaws
• a frog's bright colors
• a plant's bright flowers

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

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

Mutualism, commensalism, and parasitism are the three types of

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

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A tapeworm, which is living inside a mouse's body is a predator.

• True
• False

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