Invertebrates are creatures that do not possess a backbone.

Colour blindness is a condition in which people cannot differentiate between colours.

Insects such as wasps and butterflies go through different stages of development from eggs to

The theory of relativity explains the relationship between speed, space, time and gravity.

The cell theory explains that all living beings are made up of one or more

The germ theory of disease explains that diseases result from tiny microorganisms, including viruses, bacteria

From birds flying to cars moving on the road, numerous things in our surroundings are

A food chain explains the arrangement in which living things consume other living things as

There are different sources of energy such as solar energy, wind energy, petroleum and coal.

The atomic theory explains that everything is made of tiny particles called atoms.