All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms. The activity of an organism depends on the total activity of independent cells. Energy flow (metabolism and biochemistry) occurs within cells.

Photosynthesis evolved by three billion years ago, and released oxygen into the atmosphere.

Similarities Between Plants and Humans Since both are living organisms, plants and humans have certain characteristics in common. As cellular organisms, both feature a nucleus that is composed of four components: the nuclear membrane, nucleoplasm, nucleolus and chromatin.

Scientists might have found the common ancestor that unites all life on Earth – and it’s called Luca. Our ultimate relative was a single-cell, bacterium-like organism known as Last Universal Common Ancestor or Luca. And it could help establish how life on Earth began, at the very start.

Plants provide us with food, fiber, shelter, medicine, and fuel. The basic food for all organisms is produced by green plants. In the process of food production, oxygen is released. This oxygen, which we obtain from the air we breathe, is essential to life.

Plants are considered a critical resource because of the many ways they support life on Earth. They release oxygen into the atmosphere, absorb carbon dioxide, provide habitat and food for wildlife and humans, and regulate the water cycle [1].

We need plants for basic human purposes. We eat them in many forms; we make medicines, soaps, furniture, textiles, tyres and much more from them. Plants play a very important role in our lives. Although we now live in a highly industrialised society, we have not lost this dependence on plants.

Plants are really important for the planet and for all living things. Plants absorb carbon dioxide and release oxygen from their leaves, which humans and other animals need to breathe. Living things need plants to live – they eat them and live in them. Plants help to clean water too.

7 Everyday Items Made from Trees

• Cork oak bark. Natural Aspirin and Acne Medication.
• Aspirin tablets. Sponges.
• Sponges made from trees. Chewing Gum.
• Sapodilla tree. Carnauba Wax.
• Copernicia prunifera. Henna Dye.
• Henna tattoo. Rubber.
• Tapping into trees for rubber.