Explanation

Cations are positively charged ions. 

Cations are formed when a metal loses its electrons.

Explanation

Human blood is red because haemoglobin,

haemoglobin is carried in the blood and functions to transport oxygen.

Explanation

Skin cells form the outermost layer of the body, acting as a protective barrier.

They shield internal organs and tissues from injury, pathogens, and dehydration.

Explanation

Explanation

The nucleus is the control center of the cell, regulating all cellular activities, including growth and reproduction.

It contains the cell’s genetic material (DNA).

Explanation

Cell discovered: 1665

Robert Hooke was: scientist

He belonged: UK

Explanation

Protista includes both unicellular organisms like amoeba and multicellular organisms like algae.

Fungi also includes unicellular organisms like yeast and multicellular organisms like mushrooms and molds.

Explanation

The ostrich egg is the largest cell in the animal kingdom.

It can weigh up to 1.4 kg.

Explanation

A vacuole is a sac-like organelle in cells that stores waste materials, water, and nutrients before they are removed or used by the cell.

It plays a key role in maintaining cell homeostasis.

Explanation

Red blood cells (RBCs) are primarily responsible for transporting oxygen from the lungs to various tissues in the body.

They contain a protein called hemoglobin, which binds to oxygen molecules, facilitating their transport.