Veins have thin and elastic muscular walls. why?

Which of the kingdoms has the smallest number of known species

Any fracture or stem of fractures along which earth moves is known as a? A. strain. B. fault. C. stress. D. deformation.

Based on what you know about the scientific method, choose an animal or plant and explain how you would determine which individuals in a population were best adapted to their environment.

Which term describes the system of continuous water movement on and in the earth? a. precipitation cycle b. erosion cycle c. hydrologic cycle d. vapor cycle

1 four contributory factors that lead to poverty i community? 2 three harmful effects of poverty on ones personal heath? 3 what role can the private sector play in poverty alleviation?

consider the structure and function of fats to predict which animal would have more fat: one that live close to the poles or one that lives close to the equator?

What does the electrochemical communication do in the body?

The insertion of the human insulin gene into the bacterium Escherichia coli allowed it to produce human insulin. Which type of organism is E. coli?

When do introduced species become invasive?

If arthropods' appendages were not jointed, how would that affect them?