What does it mean when a molecule is said to be "polar"?

Which of the following do cells obtain from nutrients in food? A. lithium B. helium C. energy D. oxygen

The reduction of which energy source would have the greatest effect in minimizing air pollution? hydroelectric coal petroleum natural gas

True or false: catabolic and anabolic reactions in living cells involve the transfer of electrons from one molecule to another in reduction-oxidation reactions.

The fluid-filled structure in the ear that sends information to the brain about sound is the a. tympanum b. oval window c. stirrup d. cochlea

When the human body mobilizes its defenses against a pathogen the body recognizes the pathogens?

Why is the action of phagocytes considered a nonspecific response? A It does not occur at any specific temperature. B It is not involved with the production of any specific type of lymphocyte. C It does not respond to any specific type of hormone.

Which statement best describes the relationship between the deer and the plants?

A decrease in honey population will ...

Viruses cannot reproduce on their own and require a host organism to do it for them. This is one reason viruses are not considered to be alive

If the environment changes what is the first thing a species will do to survive