Scientists use evidence from their findings to support theories of life on earth. Which of these findings could not be used to provide supporting evidence that life on earth has changed over time? Choose the correct answer.

a) increasing complexity of fossils in younger rock layers

b) increasing diversity of fossils in rock layers following an extinction

c) transitional fossils

d) rock layers with no fossils

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.