The transfer of information across the synapse is accomplished by the release of a chemical substance called a into the synapse. These chemicals travel across the synapse and are involved in the transmission of neural impulses (they stimulate the dendrites of the next neuron). They bind with the receiving neuron in a lock

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm

What are the three groups of atoms that make up amino acids called