The endocrine system uses chemicals
The Grand Canyon is made of sedimentary rock that contains fossils up to 1 billion years old. and the several upper layers of rock contain terrestrial, or land-based, fossils, such as dragonfly wing impressions and the footprints of scorpions, centipedes, and reptiles
they are layered mounds of deposits made by precambrian algae
Answer:
Law
Explanation:
This is Newton's third law: "For every action, there is an equal and opposite reaction."
