The answer to number 1 is that not all animals have hair
Typically, gametes are haploid cells. They only contain a portion of the chromosomes because as they intertwine with the meeting gamete the other half of the chromosome will ideally fit the other half of the cell and fertilization will occur. Moreover, when a sperm or egg cell has already a complete chromosome or is diploid no fertilization will happen.
Glycolysis, a process in which the body breaks down glucose via enzymes, giving energy to the body
Cells in an organism can develop in different ways to perform different tasks.
The best approach to curbing excessive human population growth is extensive public education programmes and distribution of family planning methods in countries with high fertility rates. Most countries with high fertility rates have large numbers of the population living in poverty and this limits the access people may have to modern methods of contraception.