Answer:
D.electrical signals and chemical neurotransmitters
Explanation:
chemical transmitters are the language that neurons use to connect eachother.
Answer:
A new mutation
Explanation:
A mutation refers to the random changes in the DNA of organisms. A mutation changes the allele and genotype frequencies by the introduction of a new allele in the gene pool.
However, mutations are not the major factor responsible for changes in the gene pool of a population as mutations are rare. The rate of mutations is very slow and does not allow it to serve as a major factor to change the allele and genotype frequencies.
Yes the o horizon layer is where most plant life is like in a forest it where all the roots of grass is
