The human skeletal system comprises bones, cartilage and other structures that give the body its

The human circulatory system comprises the heart, blood and blood vessels and carries oxygen and

The process by which pollen grains are carried from a flower’s male reproductive parts to

The human immune system is a system within the body that protects humans from diseases

Hibernation is a function that enables animals such as groundhogs, hedgehogs, marmots and bears to

A flood is a phenomenon that takes place when water overflows onto land that is

The respiratory system includes the mouth, nose, larynx, lungs and other organs that help humans

Gold, one of the world’s most precious metals, originated billions of years ago during neutron

A cyclone is the circular movement of air around a region of low atmospheric pressure.

Lightning is a natural phenomenon that occurs due to the imbalance of electrical charges within