Changes in chromosome number are usually the result of what?

In gremlins, hairy shoulders are dominant over non-hairy shoulders. Peter the Gremlin, who has very hairy shoulders, was adopted at birth and he is finally reunited with his parents 30 years later.

Which of the following is true of Clydesdale and Thoroughbred horses? A. They are the same species and have different traits. B. They are different species and have the same traits. C. They are different species and have different traits. D.

Margaret, an elderly woman, needs to limit her kilocalorie intake without sacrificing needed nutrients. Keeping in mind My Plate, which of the following could she do while keeping in mind the Food Guide Pyramid? A. Eliminate carbohydrateB.

Nest building in weaver birds demonstrates how A. behaviors are influenced by inheritance and experience. B. behaviors are not related to inheritance or experience. C. behaviors are influenced strictly by inherted traits. D.

Although he is often dispirited, exhausted, and pessimistic, for the last few days Jirou has been studying, working out, and socializing with so much energy and enthusiasm that he has not had more than two or three hours of sleep each night.

Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a cell from your fingernail? A. mitochondria B. cilia C. cell wall D. ribosomes

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?