A
Because the cells and somethings forms into something new
Answer:
1. Signaling molecule
2. Signaling receptors
Explanation:
Hormones, growth factors, neurotransmitters, etc. serve the function of signaling molecules for cells. These molecules are released by one cell and bind to the receptors present on/in the target cells to elicit the desired response. Thereby, the signaling molecules serve in cell-cell communication.
For example, insulin hormone synthesized and released from beta cells of pancreas binds to its cell surface receptors present on the surfaces of liver cells and muscle cells to stimulate the uptake of the glucose from the blood.
Likewise, neurotransmitters released from the presynaptic neuron bind to receptors present on the membrane of postsynaptic neuron and serve to carry the nerve impulse to the postsynaptic neuron.
The correct answer is:
Emigration because it means people are moving out, causing the population to decrease along with a death rate.
Explanation:
if there are a high death rate and a large amount of emigration, populations will likely decrease. Emigration relates to an experience when an individual walked out to another place because of some reasons ( the most common one are: Rare resources, societal problems, depression, or solely because they required to try out their fate).