In industry, microorganisms are often cultured in an environment where ideal conditions are maintained through continual nutrient provision and waste renewal. Such a system is called a .

Continuous Culture  

Explanation:

In industry, a continuous culture is maintained by providing the nutrient on time and removing the waste materials on time so that the optimum conditions inside the medium is maintained.

It is done to minimize the efforts which is required when the preparation is done to prepare the nutrient and inoculate the bacterial species.

Then by the time the bacterial species starts growing and then the useful product is extracted. In order to save the time and efforts the nutrient is supplied and waste materials is removed along with the useful products.

the fossil record provides evidence of a common ancestor to many species.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.