Breathing(CO2) of plants for making food that is eaten by animals.and expelling the carbon from animal's body by breathing or defecation
Some factors could be:
weather
ressources
The connecting piece of a sperm is packed with gonads that produce energy.
Sperm is the male reproductive cell and is derived from the Greek word "Sperma" Significance is Root.
Sperm cannot divide and have limited life span, but after fusion with egg cells through fertilization, a substitute orgasm begins developing, starting as a totipotent zygote
