Using the chart, "CO2 and Global Temperature Trends, 1960-2005,"answer the questions that A) As average global temperature rises, what happens to the overall average precipitation? Why?
B) What does CO2 and other greenhouse gases do in the atmosphere?
C) Describe 4 ways a temperature increase of only 1°C (global warming) would impact humans and/or
ecosystems.

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.