It is true that cells spend most of their time dividing. In fact, they spend 78% of their "life" in interphase.
Answer:
The activity factor was modified. Ambulating indicates that the person is active. Even small activities require energy. So, people who can walk around and aren’t bedridden expend more calories than people who need to be on bedrest all day. Also, when the stress factor was changed to severe infection, the caloric requirement increased. This increase is probably because the immune system requires more energy to fight off the infection
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Answer:
sea floor spreading occurs at mid ocean ridges
Because the organism is distributed across the world, and isn't seen anymore, scientists can conclude tat they must have evolved. They can compare one species to the fossils they may have found, and determine that they were related. Then by looking at the species on another part of the world compare the same fossils to other animals and determine that they are similar, sharing a common ancestor.
Our lungs do not collapse when we expel air forcefully because our lungs do not ever full fill or empty of air compeletly. A small amount of air remains in the lungs no matter how hard you expel your air.