Fly populations on different food sources. she found that after about 40 generations, the evolution of reproductive isolation was under way. the mechanism of evolution responsible for this was

The growth of plants in some Arctic lakes has increased significantly in the past 150 years. Scientists attribute this increase in plant growth to the increase in surface air temperatures on Earth, also known as global warming.

Which of the following describe smooth muscle tissue? a. Uninucleate, nonstriatedb. Multinucleate, striatedc. Multinucleate, nonstriated d. Uninucleate, striated

What process keeps the amounts of molecules inside and outside the cell in balance

Sodium ions move into cells from areas of low concentration to areas of high concentration. Which of the following processes is used to move the sodium ions? A. Passive transport B. Active transport C. Diffusion D. Osmosis

Whose job is it to release the carbon that remains in the bodies of dead organisms? A producers B carnivores C herbivores D decomposers

During the process of RNA transcription, which of the following steps is not included? Initiation Elongation Termination

If you push very hard on an object but it does not move, have you done work

How might an amino acid change at a site distant from the active site of the enzyme alter the enzyme's substrate specificity? A. By changing the enzyme's stability B. By changing the enzyme's location in the cell C.

Which of the following persons has the highest risk for diabetes, hypertension and heart disease? a. A man with a BMI = 29 and a waist circumference = 37 inches b. A woman with a BMI = 27 and a waist circumference = 36 inches. c.

Which of the molecules has the sugar deoxyribose and phosphate groups in it's backbone?