What does spermatogenesis produce from one original cell.

Why do animals dont have any pets? (Ex. a bear has a pet dog.)

Organism that obtain energy by feeding on other organism

Variations chosen by natural selection are obtained by an organism: a) through use and disuse b) in order to increase in size and complexity c) before birth d) after selection has occurred e) during its lifetime as an organism

Two identical twins, Derek and Aaron, grew up in the same household without any health problems. For most of his life, Derek had a high-stress job and did not have time for exercise.

What type of joint is in a steering wheel?

Is Pinocytosis a form of passive transport?

If part of the xylem of a young oak tree is destroyed, which of the following functions would it interfere with most? A) conduction of water to the leaves B) conduction of carbohydrates to the roots C) absorption of carbon dioxide from air

20. What is a nucleotide?

Carbohydrates are the primary source of energy for the human body, for energy production. If If your body lacks enzymes that break down carbohydrates, it would be unable to get you lacked the enzyme to digest proteins, you may not absorb enough

Recall the steps of building a protein