Which of the following statements is true? no energy transformations are ever 100 percent efficient. friction between moving parts causes the loss of energy as heat. photosynthesis converts light energy into chemical energy. all of the above.

Explain how the political influence of african americans leaders became weaker.

What is a sex-linked genetic disorder that disrupts the blood's ability to clot? a.achondroplasia b.huntington's disease c.hemophilia d.albinism

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.