Which phrase best describes the benthic zone of a lake?

a. shallow water with rooted plants

b. warm, dense water

c. cold, dense water

d. open water with phytoplankton

What term means change over time?

Which type of mutation is likely to have the least effect on an organism A.) A silent mutation B.) A frameshift mutation C.) A non disjunction mutation D.) A chromosomal mutation

A plate moving at a rate of 3 cm/year is moving toward a plate that is 1,500 km away. In how many years will the plates collide? A. 50,000,000 years B. 50,000 years C. 5,000 years D. 500 years

Genes have many regulatory sites that control gene expression, one of these is called the enhancer. Which choice best describes the enhancer site?

What are some example of a scientific law?

How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.

Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?

A mineral leaves a gray trail when scraped against an unglazed porcelain plate. Which property of a mineral is being measured? A. luster B. streak C. color D. hardness

Which two systems in the human body are devoted exclusively to the regulation of organ function?

A 40-year-old man reports to his health care provider complaining of "heartburn" that occurs after eating and also wakens him at night.