What is the backbone of DNA made of?

sugar and phosphates

nitrogenous bases and sugar

nitrogenous bases, sugar, and phosphates

a polymer of nitrogenous bases

In multicellular organisms, the process of differentiation produces cells that are specialized to perform specific functions. for example, one cell may become a muscle cell whose function is to shorten or lengthen to allow movement.

What do you call the predictable changes in the composition or structure of an ecological community? A. ecological regression B. ecological succession C. ecological mining D. ecological decline

Which of the following is found in plasma? A. Water B. Oxygen C. Hormones D. All of the above

What are the two processes that create genetic variation in living things over time?

1. Explain why the temperature of ocean water will vary with latitude and depth.

What type of selection favors the average individuals in a population

Which of the following ideal criteria for elimination of a disease is addressed by the following statement: Hepatitis B may establish a chronic infection that can lead to transmission of the disease even in the absence of symptoms? A.

3. Which of the following direct quotations is punctuated properly? A. "Way to go, Sean," the coach shouted. "That was a great run"! B. "Way to go, Sean", the coach shouted. "That was a great run!" C. "Way to go, Sean," the coach shouted.

During Evolution, a process of change over time, do individuals or populations evolve?

What respiratory illness can be caused by bacteria?