The concept that the present is the key to the past is part of the
a. type of unconformity
b. law of superposition
c. law of crosscutting relationships
d. principle of uniformitarianism

D. principle of uniformitarianism

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.