False, a physical change means that the property of matter will change size, shape, color, or density. These are all examples of physical change.
When children are small they are given vaccines that are usually dead viruses given to the body. These viruses don't cause damage to body and the body takes it as a real virus and prepare antibodies in the body but when a certain real disease or virus is in the body , the already presented antibodies fight with them for the protection of the body. These antibodies remain in the body so that when a disease or virus attacks the body the antibodies are already geared up to fight against them. Thus antibodies protect the body against invading microbes or viruses.
Answer:
A. Elastic
Explanation:
an elastic collision is one which there is no overall loss of kinetic energy
