1. Centrioles can be correctly matched with F, that is, produce the spindle fibers for cell division.
2. Nucleolus can be correctly matched with G, that is, produce r-RNA to make ribosomes.
3. Nucleus can be correctly matched with B, that is, round structure within the cell.
4. Endoplasmic reticulum can be correctly matched with E, that is, channel through which molecules move in cytoplasm.
5. Golgi bodies can be correctly matched with D, that is, produce and package cell secretions.
6. Ribosomes can be correctly matched with A, that is, tiny structures which synthesize proteins.
7. Chromosomes can be correctly matched with C, that is, contain genes with the information controlling cell.
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Myelin is a lipid-made substance that surrounds the axons of some neurons. This myelin sheath acts as an electrical insulator and speeds up the propagation of the action potentials inside the neurons' axons.
Overproduction is a natural phenomenon in which the number of produced offspring is higher than the number of individuals the ecosystem can sustain. Thus, competition for limited resources occurs.
Because of the genetic variation, the organisms within a population have different chances to reproduce. Most often, some organisms have a lower reproductive success than others do.
The number of individuals with a high reproductive success is rather low as few males are very successful at passing on their genetic material.
The number of organisms with no reproductive success is also very low, as these "ill adapted" individuals will disappear from the population extremely quickly.
Genetic variation is the amount of differences between individuals. Thus, no organism taken by itself has any genetic variation.
