The diagram above suggests that A. the Earth has changed over geologic time. B. geologic eras occur in repeating cycles. C. geologic time periods occur in repeating cycles. D. the Earth has not changed over geologic time.

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.