Protists can be harmful for which of the following reasons?

select all that

a) cause disease

b) cause algal blooms

c) are a source of food

d) make oxygen

A) Cause disease

B) Cause algal blooms

Explanation:

A - Protists may look helpless, but they are deadly. Since they cause disease and even death in living things—including us humans.

B - Algal blooms are basically protists but with chloroplasts, so they are also a part of protists being harmful.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).