The liquid that contains male gametes and secretions from glands of the human male reproductive system is known as the?

1) progesterone

2) testosterone

3) semen

4) sperm

Excitation contraction coupling refers to

What is the function of the Compact Bone?

Vacuum cords are coated with rubber or plastic coating to protect people from the electricity that runs through the cord. Why is this?

The moon's average density is about the same as the density of which of the Earth's layers?

Which body of water is most likely to be a marine ecosystem? A. Pond B. Estuary C. Lake D. River

Which are biotic factors in an American alligator's environment? Choose all answers that are correct. A. temperature of the water B. amount of oxygen gas in the water C. type of grass needed for nests D. number of available mates

If you are told that the frequency of a recessive allele in a population is 10%, you are directly given q, since by definition q is the frequency of the recessive allele.

Which individual is at the least risk for osteoporosis? thin, elderly male male weight lifter in his 20s petite asian female thin caucasian female in her 40s?

What is the condition of the atmosphere at a particular time and place?

4. What did the mitochondrial DNA testing show? What do scientists believe happened to Anastasia?