Why does mature soil contain the why does mature contain most humus? a. Has the least decomposed organic material from trees and vegetation
B The mature soil has the most soil horizons
C The mature soil has the biggest layer of bedrock
D. Has the most decomposed organic material from trees and vegetation

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

How does food concentration affect yeast activity

Which nutrients contain nitrogen in addition to carbon hydrogen, and oxygen? a) vitamins. b) proteins. c) carbohydrates. d) fat