Answer:
Predation. An interaction in which one species kills and consumes another species
mark me as brainlist
The solid inner core is made of mainly iron crystals with small amounts of nickel and heavier elements such as gold and platinum. The liquid outer core is a nickel iron alloy with small amounts of heavier elements.
The reaction is called ACROSOME REACTION. The acrosome reaction occurs during the sperm interaction with the egg before fertilization occur. The acrosome is a structure that is found on the head of the sperm, it contains a chemical called acrosin which the sperm used to penetrate the egg. Sperm which can not undergo acrosome reaction can not penetrate the egg for fertilization.