(Q).
Answer the following question given this paragraph: Ancestors of mammals evolved close to 300 million years ago. They were amniotes called synapsids. Figure below shows how modern mammals evolved from synapsids. The stages of evolution from synapsids to mammals are described below. Q: How long ago did the ancestors of mammals evolve? Choices: - 10 million - 50,900 million years - 100 million - 300 million years A:
(A).
300 million years

(Q).
Answer the following question given this paragraph: In words, cellular respiration uses oxygen gas to break apart the carbon-hydrogen bonds in glucose and release their energy to build 38 molecules of ATP. Most of this process occurs within the mitochondria of the cell. Carbon dioxide and water are waste products. This is similar to burning, in which oxygen breaks the carbon-hydrogen bonds in a fuel and releases their chemical energy as heat and light. Again, carbon dioxide and water are waste. Q: What uses oxygen gas to break apart the carbon-hydrogen bonds in glucose and release their energy? Choices: - electromagnetic respiration - classical respiration - energetic respiration - cellular respiration A:
(A).
cellular respiration

(Q).
Answer the following question given this paragraph: Q: What flows across the membrane resulting in changes in the membrane potential? Choices: - electrons - acids - neutrons - ions A:
(A).
ions