Which of the following statements about extinction is true? choose one: a. recent species are disappearing so slowly that researchers suggest our present time is another mass extinction. b. some species may become extinct because they evolve into a new species. c. at least five mass-extinction events have occurred during the last 500 million years. d. the movement of tectonic plates does not often cause mass extinctions, because all species move along with the plate.

C. At least five mass-extinction events have occurred during the last 500 million years.

Explanation:

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.