Slideshow: Plants. Let's take a few minutes to look at plants of the world. What do plants have in common? They have cell walls made of cellulose and chlorophyll in their cells. Plants. If you're not a microbe and you're not an animal, you are probably a plant.
There are about 300 thousand known species of plants. Because plants adapt so well to almost any climate, scientists needed a way to organize the hundreds of thousands of species. In the same way there is a system of classification for animals, there is also a system of classification for plants. Photosynthesis Video. Tree Identification Using a Tree Leaf Key - Name a Tree by Studying its Leaf.