The heart is a
that pumps blood and other materials through the body.

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

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.

If people from georgia have just experienced an extremely cold winter the last couple of months, what would the climate most likely be classified as? polar temperate maritime tropical