The older the Earth's crust, the denser it is.
The key difference between energy flow and matter cycling is that energy flow shows the energy transmission from one trophic level to next trophic level in food chains while matter cycling shows the flow or cycling of elements through the living and nonliving parts of ecosystems
The answer is b because it is negative on our world
Actually, the hormone is issued by the gland to go to a certain spot in the body. Like the adrenal glands release the hormone "adrenaline" when you're in a dangerous, or stimulating situation
Answer:
We breath in then out through our lungs
Explanation:
