Two of the risk factors for down's syndrome include which of the following?

options
exposure to high temperatures
increased age of female
infectious hepatitis
over exposure to sunlight

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

What is the relation ship between structure and function in an organism

Talking listening and reacting non verbally are all part of communicating