Which would best be described as abiotic? water in a stream
fish in a stream
bacteria in the soil
roots in the soil

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.

Which particle controls what element an atom is?

Are humans interfering with or a part of evolution happening today? find examples of evolution seen in recent history that could be caused by human activity.