Probably progression... overload is too much i would think so progression
The answer is fertilization.
Fertilization is when the sex cells' nuclei (the nucleus of both an egg and a sperm) combine. After fertilization, the male and female chromosomes will have also joined together to create a new combination of DNA for the offspring.
Because it is to prevent <span>is to injury and muscle strain</span>
Individual decision making is more limited than collaborative decision making because as an individual you would only have one or two points of view on the subject as well as knowledge and ideas. If you were to work with more people to decide on something then there would be a good chance that everyone would be able to pitch in ideas and different points of views to overall decide.