Question

Please explain your answers if you can. Thank you!

What is the main reason so many species are currently under threat of extinction?

A. extinctions are cyclic, and we are in a peak now

B. habitat destruction and transformation

C. lack of appropriate ecosystem services

D. overhunting and overfishing by humans


In sustainable farming practices involving crop rotation, should the land be covered at all times with plant material?

A. No, the decaying foliage harbors disease.

B. No, it should be tilled under to add nutrients to the soil.

C. yes, because this minimizes the breeding of pests in soil

D. yes, this lessens erosion of topsoil.

What is the term for species that have much larger impact on an environment than would be predicted from their biomass?

A. primary species

B. dominant species

C. primary producers

D. keystone species

What characteristic of a desert environment is the most defining?

A. low availability of water
B. high temperatures
C. high quantity of light
D. presence of sandy soil