Answer:
adding chlorine, checking the water.
Explanation:
Because this increases the quality of the water while the rest improve either quantity, or ease of access.
Answer:
increase ozone in the stratosphere
Answer:
Alana put mailed 2 letters in each of the 3 mailboxes
Explanation:
Answer: (idk if i chose more than 1)
I believe its the Last option (optional A)
Explanation:
it gives structures for reproduction, immune system, hormones, and protection of cells
