It refers to the act of grouping organism, based on what they have in common.

The modern classification system recognizes how many kingdoms?

The level of classification that comes after kingdoms is

A dichotomous key is used to

Combustion refers to the process of burning organic matter with the help of oxygen, in order to release carbon dioxide in the atmosphere.

Base of the pyramid represents the producer tropic level.

Land Pollution activities that involve the construction of manmade structure often come with the destruction of the natural terrestrial ecosystem.

Photosynthesis is applied by all plants and some types of bacteria and algae.

Water pollution bodies of water contain natural habitats for aquatic and marine life forms.