Which type of exercise strengthens the skeletal and the cardiac muscles?

a.

aerobic exercise.

c.

mental exercise.

b.

resistance exercise.

d.

none of the above.

A common genetic disorder characterized by bent and twisted red blood cells is called

Which could be a reason viruses are considered nonliving things? a. Viruses come from cells. b. Viruses produce cells. c. Viruses are made of DNA and proteins, but not cells. d. Viruses attack cells and are dangerous to them.

How does DNA evidence support the theory of evolution

What cells in the body respond to glucagon by breaking down glycogen and releasing glucose?

The researchers observed a random sample of mating pairs. The spiders had all been identified and measured before the mating occurred spontaneously.

Which factors affect a rivers load

Which sentence best captures a central idea of the biography

Is a fossil still a fossil if it is preserved artificially? For example, (Is a mummy a fossil even though it was preserved by people?)

Which type of macromolecule is the quickest source of energy for the body

Which two structures contain DNA