# Organisms
Every organism is an animal, a fungus, a human-being, a micro-organism, or a plant.
# Animals
Every animal is a vertebrate or an invertebrate.
# Vertebrates
Every vertebrate is an amphibian, a bird, a fish, a mammal, or a reptile.
# Invertebrates
Every invertebrate is an annelid, an arthropod, an echinoderm, a mollusk, or a protozoan.
# Amphibians
Caecilians, frogs, newts, salamanders and toads are amphibians.
# Birds
#Xxxx are birds.
# Fish
#Xxxx are fish.
# Reptiles
Crocodiles are reptiles.
# Annelids
Earthworms, roundworms and flatworms are annelids.
# Arthropods
Crabs, spiders and insects are arthropods.
# Echinoderms
Starfish, sea-urchins, sand-dollars and sea-cucumbers are echinoderms.
# Mollusks
#Cockles, cuttlefish, clams, mussels, nautiluses, octopuses, oysters, snails and squids are mollusks.
Cuttlefish, clams, mussels, nautiluses, octopuses, oysters, snails and squids are mollusks.
# Protozoa
#Amoebas and flagellates are protozoa (plural of protozoan).
# Mammals
Every mammal is a cetacean, a marsupial, a rodent, a monkey, or a human-being.
# Cetaceans
Whales and dolphins are cetaceans.
# Marsupials
#Kangaroos, koalas, opossums, and Tasmanian-devils are marsupials.
Kangaroos, koalas, opossums and tasmanian-devils are marsupials.
# Monkeys
Bonobos, chimpanzees, gorillas, marmosets, orangutans and squirrel-monkeys are monkeys.
# Rodents
Beavers, guinea-pigs, hamsters, mice, porcupines, rats and squirrels are rodents.
# Arthropods
Every arthropod is an arachnid, crustacean, or insect.
# Arachnids
Mites, ticks, scorpions and spiders are arachnids.
# Crustaceans
Crabs, lobsters and barnacles are crustaceans.
# Insects
Beetles, flies, butterflies, moths, dragonflies, bees, wasps and praying-mantises are insects.
# Human-beings
Every human-being is a vertebrate.
Every human-being is a mammal.
John is a human-being.
# Justification reports
#Dev#Display the justification report about vertebrates.
#Dev#Display the justification report about mammals.
#Dev#Display the justification report about crocodiles.
#Dev#Display the justification report about John.