An organism, survive a battle of life according to the occurrence of changes.

For example: if the water is on a clay soil, the water perforation from the upper surface to lower is not possible because of clay particles of sand, water remains in the upper surface and not useful for a plant, the root of the plant is not able to absorb the water. When this stage is persisting, there is a development of worm and moth, mosquito developed. This ecosystem is now meant for this type of organism.

Muddy, loose sand with highly porous particles of sandful water, the root of the plant is able to absorb the water an accent of sap mechanism to conduct for its survival. Here this eco system selected the plant kingdom to develop.

Waterfall and less soil on the bottom selected the living organism of fishes and worms like lives.

Abundant plants like shrubs and herbs are selected moth and earthworm

Abundant plants like trees in a cluster dense and vast with hill and mountain selected the mammals where they can stay in families.

When you talk and assume like this, all the living organism are based on the primitive a single sensed plant kingdom, their composition of physiology and anatomy are all a simpler mechanism of molecular setup and thus evident that they are the first born from the soup formulated nature.

Little more complexes are the next advanced style of organisms like earthworm, fish, rodents, mammals etc.

In other words, the entire organism except the plant, are consuming and eating the plant products even human. A plant dependent mechanism

So the plants, which purely depend upon the sunlight to synthesis the food, are a primate birth on the earth.

When the senses are more complex they are called in term of advanced style of life or a style of dominance, this is otherwise called a natural selection.

An organism, survive a battle of life according to the occurrence of changes in eco system the nature.

An organism is able to adapt its mechanism according to the ecological changes and able to survive and multiply its species are called naturally selected organism.

Darwin said, the concept of natural selection by way of one example that is:

A giraffe was originated with short necks only not a long necked. When the plant was as herb or shrub, the short-necked giraffe was fable to feed the food and survived.