Plants are living organisms which are found all over the world on land as well as in the ocean and other bodies of water. They are found in all types of climates and habitats, from temperatures as cold as the Arctic and Antarctica, to temperatures as warm as the warmest dessert of Death Valley. Plants can be so small that you cannot see them. Or they can be as tall as skyscrapers. 

Plant Similarities 
There is an estimated 390,900 species of plants in the world. All of which have a few things in common. Including the need for sunshine, water, and air to grow; the inability to move; and cells made of cellulose. Most plants also use photosynthesis to produce their own food. This process requires sunlight (energy), water, and carbon dioxide (a gas).

Plant Differences
The differences between plants can be used to organize them into groups. The two major ways to group plants is whether or not they produce flowers (flowering or non-flowering), or how they get their water (vascular or nonvascular).

Vascular plants have special structures (xylem and phloem) that carry water throughout the plant. All vascular plants have roots, stems, and leaves, and get their water and nutrients from the soil. These plants include nonwoody/herbaceous plants (grasses, herbs, climbers and creepers)  and woody plants (shrubs and trees).

Nonvascular plants do not have true roots, stems, or leaves, and get their nutrients from the rain and surrounding air. Because of this, they are small and grow on moist surfaces such as other plants, rocks, and the surface of water. These plants include mosses, liverworts, hornworts, fungi, lichen, and algae. 

Reproduction
Plants reproduce using one of two methods, either by seed or spore. Most vascular plants produce seeds which form in flowering (angiosperm) or non-flowering (gymnosperm) plants. All nonvascular plants produce spores. Ferns, which are vascular plants, produce spores.