Answer:
the answer is B, The activation energy must be reached.
Explanation:
Description of the nervous system
Neurons send signals to other cells through thin fibers called axons, which cause chemicals known as neurotransmitters to be released at junctions called synapses
During meiosis, genetic recombination may occur more than once through the process of cell division, resulting in an increase in genetic variability.
The answer would be C.mountains
