Reflection and absorption by the atmosphere prevent some from reaching earth's surface.
a.
ozone
c.
nitrogen
b.
radiation
d.
oxygen

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

Animals that have thick fur and ae able to store large amounts of body fat live where ?

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.