How do the structures labeled A and B in Figure 30–7 make the small intestine specially adapted for absorption of nutrients?

The energy of blowing wind can be harnessed to create electricity. why is wind considered a renewable energy source? a) wind does not cause destruction of the environment. b) wind turns the blades of a windmill that creates electricity. c) wind provides only a very small amount of electricity to the united states. d) wind comes from atmospheric conditions that are available indefinitely.

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?