12. Each of Earth's mass extinctions a. wiped out at least half of Earth's existing species
b. caused a drop in background extinction rates
was followed by a decrease in biodiversity

The answer would be dogs.

This is giving me a headache i have asked others and they don’t know it either

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.