Leukocytes are part of the intergumentary system are surface barriers to infection cannot reproduce without a host cell are produced and stored in the thymus and spleen

Leukocytes cell

Explanation:

Also known as white blood cell are colorless cell in the blood and body fluid , active in fighting foreign bodies and diseases in human system by producing antibodies , ingesting strange bodies ,and destroying cancer cells .

It is produced by hematopoietic cells

There are five different types of it with different functions of disease fighting namely basophils , neutrophils ,eosinophils,monocytes and lymphocytes.

Exercise activities can increase the number in the system while rest takes it down

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: