5) gases such as oxygen and carbon dioxide cross the plasma membrane by a) special gas transport proteins. b) osmosis through the lipid bilayer. c) active transport through protein channels. d) passive diffusion through the lipid bilayer.

Which of the following is an example of this type of co-evolution

9. wind power creates pollution. water air soil noise

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.