How can scientist determine the age of a rock sample using a half-life of a parent isotope?

Consider the diagram below, which represents components of the biosphere. what do the two arrows in the diagram most likely represent? a. radiation b. photosynthesis c. cellular respiration d. energy conversions will give to anyone who answers quickly

Compare the composition of the moon's surface with the composition of the earth's surface.

Which enzymes break down carbohydrates?