*Sigh* It's important because conserving energy helps the environment and lets you have a little more pocket money when the bills come around.
Answer:
a.
Explanation:
pathogens may enter the body and cause illness.
One example of passive transport is diffusion, when molecules move from an area of high concentration (large amount) to an area of low concentration (low amount). Molecules are said to naturally flow down their concentration gradient
Answer:
d.
Explanation:
You need a small dose of the disease so your body can fight it and become immune.
