the three general classifications are sensory neurons, motor neurons and interneurons. I don't know how they work together to produce a response to an environmental stimulus:( sorry
Answer:
No, viruses are not considered cells as they're parasitic and can't live on their own. A virus has to infect living cells in order to survive, so it's not considered a cell.
The cell wall and chlorophyll are not found in animal cells.
Hope this helps!
-Payshence
The Ecosystem will be out of balance.