Give two examples of how the integumentary system, skeletal system and muscular system interact.

Skeletal system is composed of axial , appendicular skeleton & teeth.Axial skeleton includes skull bones, rib cage & spinal cord.Appendicular skeleton include arm bones & leg bones.

Relation to the Integumentary System:

Vitamin D is important for strong bones.Its absorption takes place through the skin to work with calcium for the maintenance of healthy bones.

Relation to the Muscular System:

acts as a support system for body

works with muscles to move the limbs

gives muscles something to pull against

Muscular System: It includes muscles. It works with nervous system to move the body.

Relation to skeletal system:

Skeletal muscles move the bones

Tendons connect muscles to bones

Relation to Integumentary System:

expulsion of sweat when muscles are in use

Integumentary System:

It includes skin, hairs and nails.It is throughout the entire body. The main function is the protection from outside invaders. Skin is first line protector for the body.

Relation to Muscular System :

Muscles are protected by skin

Sweat glands present in the skin results in sweat expulsion due to muscle contraction

Relation to Skeletal system:

Bones protection

Vitamin D is formed by the skin which is very much important for absorption of calcium in the bones.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: