Question

Find more topics from your Environmental Studies or Mathematics textbooks for drawing tree diagrams. Draw and label the diagrams.

Life on earth began with unicellular I organisms known as protozoa. The following are the stages of evolution of animals. Invertebrates are animals without a backbone, for e.g., a snail. The vertebrates are animals which have a backbone. E.g., Aquatic animals like fish. Animals which: live in water and also on land are called amphibians. E.g. A frog. A few invertebrates are worms and mosquitoes and a few I vertebrates are reptiles.

Answer 1