The number of trout in a lake drops when the lake is polluted. The trout population later increases, but the allele frequency is different than it was before the pollution. What type of situation is this?

1. When the concentration of water is greater, what is the concentration of solute? 2. The solute concentration is greater outside the cell so where will water flow?

Cells with two of each kind of chromosome are described by the term

What is the difference between sexual reproduction and asexual reproduction in plants?

Although pyruvate is the end product of glycolysis and no more ATP is generated by fermentation of pyruvate to ethanol, yeast produce ethanol under anaerobic conditions because A. pyruvate export requires more energy than ethanol export. B.

Scientist developed a vaccine to protect humans from the H1N1 virus which cost 17,000 deaths in 2009. Which of the following persons would most likely contract the H1N1 virus? A.

Why does hurricane season occur from late spring through fall in the Atlantic region? A. Hurricanes need warm oceans waters to form B. hurricanes need the high air temperatures to form to form. C.

Earth's most recent era is the

During what process is water produced

Water, fuel, food, and raw materials are examples of what? A. regulating services B. cycling of matter and energy C. natural resources. D. cultural services

Which planet formed near the Sun where the solar system's temperatures were very high?