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.

Scientists believe that the universe originated from a tiny point that suddenly expanded. They call

The theory of plate tectonics explains that the Earth’s lithosphere comprises enormous tectonic plates.

Gravity is a force that draws things towards each other. It is an invisible force

The theory of evolution explains how living organisms change certain features to adjust to their

Creatures such as insects, fish, amphibians and reptiles cannot adjust their body temperature according to

Sleep plays a vital role in enhancing the functions of the brain and helping the

The tongue is a muscle that plays an important role in helping humans speak, taste