The brain loses 5-10 percent of its weight between the ages 20 & 90.
Answer:
A.
Explanation:
Sexual reproduction requires that diploid organisms produce haploid cells that can fuse during fertilization to form diploid offspring.
C. Tree roots split apart rocks in the ground
The correct answer is option d, that is, neurotransmitters.
A neurotransmitter refers to a chemical component, which is discharged at the terminal of a nerve fiber by the introduction of a nerve impulse, and by diffusing across the junction or synapse. It helps in the transfer of the impulse to another muscle fiber, nerve fiber, or some other composition. Acetylcholine is a kind of neurotransmitter, that is, used by neurons in the CNS and the PNS in the control of activities ranging from heart rate and muscle contraction to digestion and memory.
