Spayed means a female dog has had her reproductive organs (ovaries and uterus) removed. Neutered means technically that an animal has been de-sexed, but usually is used to refer to a male dog being castrated.
A complement is a word or word group. that completes the meaning of a. verb. Every sentence has a subject. and a verb. Sometimes the subject. and the verb can express a. complete thought all by themselves.
The complement system The complement system A defensive system consisting of over 30 proteins produced by the liver and found in circulating blood serum. Complement kills microbes in three different ways 1. opsonization 2. inflammation 3. Cytolysis A Cascade system The complement works as a cascade system.