Three biology questions

Question

Which of the following is a true statement about the impact of man's activities upon the biosphere?

a. deforestation has increased the rate of ozone depletion

b. fragmentation increases available habitats

c. eutrophication of waterways decreases available nitrates

d. toxic chemicals are rapidly decomposed in most ecosystems

e. agriculture decreases biodiversity

Under which conditions are r-selected organixms most likely to be the dominant species rather than K-selected organisms?

a. the final stages of succession

b. at the high water mark on a beach

c. in a young woods

d. in an old growth forest

e. in a grassland

All of the following are examples of mutualism except?

a. protozoans living in the gut of termites digest the wood the insects eat

b. nitrogen fixing bacteria in root nodules of legumes produce nitrates

c. barnacles attached to whales acquire transportation

d. lichens living on bare rock

e. green algae harbored by a Paramecium produce carbohydates

Answer 1

1. b

2.a

3.d

glad i helped