Answer:
There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites. Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature.
Explanation:
Answer: A semi-permeable membrane is that which only allows certain
substances to pass through.
Zane may be diagnosed with major depressive disorder.
When a person is depressed, they are feeling low all the time. They are not really interested in anything, and spend a lot of time sleeping because they don't see a point in doing anything else. This is what Zane is experiencing due to his depression.
Answer:
D
Explanation:
If a group of organs working together is called an organ system, and there are about 11 major body systems including the nervous system, the nervour system must be an organ system.
