It’s option c, ratios of surface area to volume
Answer:
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.
A swarm of bees would be in an ecosystem
