Science - Chapter 4

Ecosystems are healthy when _.

• they are balanced
• it is summer
• it is winter
• they are unbalanced

A _ is an organism harmed by a parasite.

• host
• parasite
• consumer
• herbivore

Succession is the gradual change of an ecosystem over time.

• true
• false

Succession is the rapidl change of an ecosystem over time.

• true
• false

_ is a relationship in which one species benefits and the other species is unaffected.

• Mutualism
• Commensalism
• Parasitism
• Symbiosis

_ is a relationship in which both species benefit.

• Mutualism
• Commensalism
• Parasitism
• Symbiosis

_ is a relationship in which one species benefits and the other species is harmed.

• Mutualism
• Commensalism
• Parasitism
• Symbiosis

_ is the interaction between two different organisms living in close physical association.

• Mutualism
• Commensalism
• Parasitism
• Symbiosis

When two or more species are in competition, they must use the same limited resources.

• True
• False

The deer on the Marshall Elementary School campus survive because _.

• their needs are met
• they have driven out all of the other animals
• humans feed them
• humans keep them as pets