The paramecium is a single-celled organism that reproduces asexually. The offspring of a paramecium usually contain

Which process allows a mammal to continue to grow in size?

What structure does the sperm travel through to get to the egg

Testosterone directly affects the

Three human hormones most directly involved in sexual reproduction are

Which process produces only identical offspring?

After a zygote is formed, specialization of cells occurs. Through which process do the cells of a zygote become specialized?

What structure does the baby grow in

Which activity would be prevented by blockages of a males vas deferens ("tube")

Exposure to certain environmental toxins, such as pesticides, may reduce fertility in males by interfering with their ability to produce gametes. These toxins are most likely having an effect on the

Which cell process occurs only in organisms that reproduce sexually?

All the genetic information needed for the organism to develop is first present at

Which female structure produces chemicals that regulate the reproductive cycle?

What structure does the sperm leave the body out of it?

A mutation in a fruit fly could be passed on to its offspring if it occurs in the:

The variations that exist in a population of wild giraffes are usually a result of events that occur during

What process produces sex cells

In humans, the placenta is essential to the embryo for

The male sex hormone is

Why does alcohol affect the baby the most during the first trimester

What process occurs when an offspring is made using one parent

What process creates a zygote

The reproductive structure in a female mammal that produces sex cells is the

What structure produces sperm

What is a characteristic of reproduction in humans