Human sperm and eggs contain 23 chromosomes. Human zygotes contain 46<span> chromosomes. The type of cell division that produces gametes with half the normal chromosome number is called meiosis. It is used to produce cells for repair and asexual reproduction.</span>
The way in which humans are altering the envrionment is one of the main reasons why pathogens move from one species to another. The emergence of hemorrhagic fever in Argentina is an example of how human change to the environment has caused a cross-species transfer.
Hydrogen Gas has been nonexistent in the atmosphere since that time period
Photosynthesis, the process which uses light energy to power the combination of carbon dioxide and water to form glucose and oxygen.
I would go with C because it’s the only that makes any logical sense. All the others except B are fillers