Without plants, nearly all life on Earth 1. Plants provide oxygen for humans and animals to breathe and they provide food for many animals. There are about 260,000 plant species in the world today. They 2on land, in oceans and in fresh water. They were the first living things on Earth. Like animals, plants are living things, or organisms. These three features 3plants from animals:
• plants have chlorophyll, a green pigment necessary for photosynthesis;
• their cell walls 4sturdy by a material called cellulose;
• they are fixed in one place (they don't move). Plants 5 into two groups: flower- and fruit-producing plants which include all garden flowers, agricultural crops, grasses, shrubs and most leaf trees. Non-flowering plants include pines, ferns, mosses and conifers (evergreen trees or shrubs that produce cones).