to support life, why must a planet have a roughly circular orbit around a sd tar? A. so fresh water is available. B. to keep the proper air molecules in the atmosphere. C. to support chemical reactions. D. for temperature regulation

If there were a sudden increase in blood volume, what would the baroreceptors do and what would be the effect of that reflex?

Which tissue forms coverings, linings, and glands

Of the different sources of genetic variability which one produces the variation seen by the combination of any particular male gamete to any particular female gamete?

Why is the sodium-potassium pump considered an active transport? Which direction are the sodium and potassium bing pumped? How many sodiums are being pumped? How many potassiums are being pumped?

What is the hardest tree in the world today? Enter your answer in the box below.

Fossil records suggest major changes in early vascular plants that favored the evolution of land plants. Which was one of these major changes? Select one of the options below as your answer: A. Development of fruit B. Development of seed C.

What deep sea mining is

Three general patterns of population dispersion are

State how matter moves through the biosphere. State how energy moves through the biosphere. Explain each statement using examples to illustrate your explanation

New technology, such as more effective irrigation techniques, could benefit society by