1 point Carbon dioxide is identified as a greenhouse gas. Analyzing the graph
above, what has been happening to carbon dioxide levels in our
atmosphere?
Carbon dioxide levels continue to increase and decrease
Carbon dioxide levels have fluctuated over the years, but since 1950 have
exponentially increased
Carbon dioxide levels are starting to decrease after 1950
Carbon dioxide has remained relatively constant for the last several hundred thousand
years

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What is the main fuel source for the work of the cell

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.