Answer:
The nervous system helps all the parts of the body to communicate with each other. It also reacts to changes both outside and inside the body. The nervous system uses both electrical and chemical means to send and receive messages.
Explanation:
Answer:
research question: how do different humidity levels affect the heights of different types of trees
independent variable: humidity level
dependent variable: tree height
constants: temperature, light, duration of time
control group: tree left outside in normal conditions
Explanation:
Explanation:
The role of active cytotoxic T cells is to attack <u> </u><u>body cells that have been infected</u>
The appropriate response is an opponent-process theory. Opponent-process theory is a mental and neurological model that records for an extensive variety of practices, including shading vision. This model was first proposed in 1878 by Ewald Hering, a German physiologist.
Answer: high and low
Explanation: high and low
