LIFE ON EARTH

1. VARIATION

1.1. CAUSE

1.1.1. GENETIC

1.1.2. ENVIRONMENTAL

1.2. TYPES

1.2.1. CONTINUOUS

1.2.2. DICONTINUOUS

1.3. SORTING KEY

2. KINGDOMS

2.1. PLANTS

2.1.1. FLOWERING PLANTS

2.1.2. CONIFERS

2.1.3. FERNS

2.1.4. MOSSES AND LIVERWORTS

2.2. ANIMALS

2.2.1. VERTEBRATES

2.2.1.1. FISH

2.2.1.2. MAMMALS

2.2.1.3. REPTILES

2.2.1.4. BIRDS

2.2.1.5. AMPHIBIANS

2.2.2. INVERTEBRATES

2.2.2.1. CNIDARIANS

2.2.2.2. FLATWORMS

2.2.2.3. ROUNDWORMS

2.2.2.4. SEGMENTED WORMS

2.2.2.5. MOLLUCS

2.2.2.6. ECHINODERMS

2.2.3. ANTHROPODS

2.2.3.1. ARACHNIDS

2.2.3.2. INSECTS

2.2.3.3. MYRIAPODS

2.2.3.4. CRUSTACEANS

2.3. FUNGI

2.4. PROTISTS

2.5. BACTERIA