Which of these is an effect of an algal bloom ? a. bacteria are introduced to break down hydrocarbons in an oil spill . b. materials containing metal are toxic to organisms that live in them . c. the mercury contained in fish builds up in animals that eat the fish . d. an increase growth in microorganisms results in oxygen depletion (apex)

The correct answer is option D

The growth of algal bloom is caused due to excessive runoff rich in the nutrients like nitrogen and phosphorous. This run off comes from the agricultural field.

These nutrients aids in the growth of the algae(microorganisms) in large number. This growth forms a layer on the water body and use the oxygen present in the water and makes the water oxygen deficient.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.