Which of the following best explains why ecosystems need a continual influx of new energy?

a.

photosynthesis feeds herbivores, carnivores, and decomposers.

b.

as energy is recycled, a small amount is lost as heat.

c.

energy flows through an ecosystem and cannot be recycled.

d.

cellular respiration does not feed back into other processes.

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell