Answer:
a hypothesis has no specific evidence of being true
Answer:
B
Explanation:
once neurotransmitters are released into the synaptic cleft, it binds to its receptors at the postsynaptic membrane. voltage gated calcium channels open and allows calcium to flow in, an action potential is generated immediately and reaches the end of the axon
C because oxygen was a byproduct of photosynthesis and proved to be EXTREMELY important in the atmosphere.
The answer is; fossil
Fossil is defined as any dead organism ( or its trace or impression) of a past geological time that is naturally preserved in the earth in geological features such as rocks, bogs, and etcetera. Coral reef is no exception because it is considered a living organism. It is composed of colonies of coral polyps and algae that secrete a carbon carbonate skeleton.
