Answer:A
Explanation:The anatomy and behavior of that animal's immediate ancestor..
Answer: Oxygen is required for cellular respiration and is used to break down nutrients, like sugar, to generate ATP (energy) and carbon dioxide and water (waste). Organisms from all kingdoms of life, including bacteria, archaea, plants, protists, animals, and fungi, can use cellular respiration.
Explanation:
Answer:
Trace fossils include footprints, trails, burrows, feeding marks, and resting marks.
Explanation:
When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights