in-class review Unit 2

Which community has higher species evenness?

• Community A

• Community B

What is the species richness of the community?

Why is biodiversity important to ecosystems?

• It helps populations adapt to ecological changes.

• It increases at each level of the food chain.

• It provides more abiotic factors for the ecosystem.

Which habitat exhibits the greatest biodiversity?

• A habitat with 15 different species with about 300 individuals each
• A habitat with 10 different species with about 75 individuals each
• A habitat with 4 different species with about 150 individuals each
• A habitat with only one species with about 2000 individual

A species that no longer exists is said to be _______________.

• extinct

• endangered

• threatened

• born

a species whose population has decreased to a point that it may die out

• extinct species

• threatened species

• mass extinction

• endangered species

What is an invasive species?

• A native (naturally found) species which are added to an area. 
• A non-native (not naturally found) species added to an area. 
• A keystone species in an environment
• none of the above

What is a Niche?

• An organism in a habitat

• A role of an organism plays in a community

• A community of organisms

What are survivorship curves?

• curves that describe the number of survivors over time

• curves that tell us what the limiting factors are

• curve that tells us about the carrying capacity

• a curve

What is the carrying capacity mean?

• The number of individuals an area can carry

• the number of births

• The number of deaths an area has

• not sure