4.) an activity carried out by every living plant and animal a. photosynthesis
b. respiration
c. reproduction
d. transpiration

please help! due soon !!!

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.