egg (female) and sperm ( male)
A cells relatively constant internal physical and chemical conditions are called Homeostasis.
Answer:
B
Explanation: They make up most of a cell membrane
According to http://www.ucsusa.org/global_warming/science_and_impacts/science/ozone-hole-and-gw-faq.html#.WQjhDfW...
I think the answer is B.CFC
