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.

c

explanation:

a. by using fur or clothes to trap heat energy near the body