There is a lot of competition. From food, water, shelter, mates... only the best, the organisms with the desirable traits survive. They survive and are able to reproduce, passing on their genes to the next generation. As this natural selection occurs, the traits that are necessary for survival are passed on, and over a long period of time this results in evolution.
The labeling of the cell represents.
The label A is Nucleus: The nucleus of the cell carries the hereditary material DNA from one generation to another generation. This carries the traits from one generation to another.
The label B is Cytoplasm: This is the fluid part of the cell which has all the organelles floating in it.
The label C is ribosomes: It is the an organelle present in that that is responsible for the protein synthesis.
The label D is Nucleolus: It is known to be the largest structure in the nucleus of the eukaryotic cell. It helps in the signal recognition pathway.
Apocrine glands develop in areas abundant in hair follicles, such as on your scalp, armpits and groin. Sweating is your body's mechanism to cool itself. Your nervous system automatically triggers your sweat glands when your body temperature rises.
