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Sperm contain genetic material on how many chromosomes?

Which factor may case genes to mutate?

Which factor speeds communication between the right and left hemispheres in the adolescent brain?

Which feature on this diagram can best be described as an arete?

Young people are coming out as gay or lesbian at later ages than in prior generations.

The most common cause of death during volcanic eruptions in the last 500 years has been a superheated cloud of pulverized rock and gas that rushes down the slopes of a volcano at speeds of up to 100km per hour. The effect is called:

Which statement describes mitosis?

An artesian well discharges at the Earth’s surface because the well outlet is:

Most cells in the body reproduce through a process called ______.

The Sahara is a desert primarily because it is located ____________.