Which of the following are primary lymphoid organs?

a. bone marrow and thymus

b. appendix and spleen

c. lymph nodes and tonsils

d. spleen and thymus

When food molecules combines with oxygen what is released?

Which statement is not part of the concept of natural selection? Variation occurs among individuals in a population. More individuals are produced than will survive.

Which of the following is true of photosynthesis

What is it called when all the chemical reactions build up or break down in an organism

What climate region in North America is influenced by the prevailing westerlies?

In the nervous system reflex arcs are stereotypes, repeatable and unlearned. select one: a. True b. False

A bird is observed to nest along the coastline. It then spends hours out in the open ocean feeding on fish. What is this behavior called? This behavior of sea birds is termed.

A genotype is the collection of all the genes occurring in members of a species.

What is true of carbon atoms?

Is it easy for breeders to produce mutants?