In how many directions can energy be cycled?

A)Two
B)Mаnу
C)One
D)None

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

The structure that houses the cells genetic information.

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.