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Leucocytes are also called white blood cell. They are irregular and amoebaoid in shape.

Kidney is an organ that perform lots of function one of which it helps in removing large quantity of water from the blood in order to maintain normal balance in the body system

Systemic circulation involves the movement of blood between the heart and all other parts of the body besides the lungs.

Mutation involves the changes in the genes of an organism due to some factors resulting in a new character that can be inherited.

DNA is located in the nucleus of cells. It is responsible for the storage of organisms's hereditary traits and helps in directing the day to day metabolic activities of each cell in the organic.

Albinism is the condition in which the skin of an animal is non-pigmented because of lack of the pigment called Melanin. It is controlled by Recessive genes.

Spermatogenesis is the process whereby male sex cells or gametes (sperms) are produced in the testis.

Fusion of sperm and egg nuclei is an example of fertilization in mammals.

Mutation involves the changes in the gene resulting in an inheritable character, therefore not having effect on the rate of change of the numbers in a population.

Cerebrum is the largest part of the brain and it controls all voluntary actions like speech, dancing etc and also concerned with the concentration and co-ordination of impulses.

Autonomic nervous system is concerned with the control of the body's involuntary activities e.g breathing, heartbeat, digestion etc

The glomerulus helps in the mechanism of excretion (formation of urine) in mammals. It does not contain the blood corpuscles.

Charles Darwins theory is that of natural selection not of use and disuse

Ecology is best defined as the study of the inter-relationship between living organisms and the environment.

During respiration process in man under expiration process the thoracic cavity does not increase in volume