Chemical : any basic substance that is used in or produced by a reaction involving changes to atoms or molecules
Noun The government has pledged to reduce the amount of chemicals used in food production.
Paleontologist: In this book we find out how paleontologists go about looking at the effects of impact events and determining their roles in biological changes.
Noun Now my childish image is of a paleontologist who has discovered his favorite dinosaur.
Bacteria : very small organisms that are found everywhere and are the cause of many diseases
Noun a colony of bacteria
Worms : a small animal with a long, narrow, soft body without arms, legs, or bones
Noun The kiwi bird eats worms, other invertebrates, and berries.
Granite : a very hard, grey, pink, or black rock, used for building
Noun Al-rich relic material from the formation of the rapakivi granite melt is another source of assimilation.
Marble : a small ball, usually made of coloured or transparent glass, that is used in children's games
Noun Ventral surface of thorax and abdomen brown, more or less extensively suffused and marbled with bluish or greenish grey.
Arthropod : a type of animal with no spine, a hard outer skin, legs with bones joined together, and a body divided into different parts, for example a spider, crab, or ant
Noun After the final visual count, the cages were carefully emptied with a blower-vac to obtain near-total numbers of arthropods
Ocean : a very large area of sea
Noun These mysterious creatures live at the bottom of the ocean.
Asteroid : one of many large rocks that circle the sun
Noun Scientists are hoping an asteroid will clue them in about early life on earth.
Coyote : a small wild animal like a dog that lives in North America
Noun Some birds are killed by golden eagles or coyotes
Rabbits : a small animal with long ears and large front teeth that moves by jumping on its long back legs, or the meat of this animal eaten as food
Noun a pet rabbit
Reptile : an animal that produces eggs and uses the heat of the sun to keep its blood warm
Noun Humans, insects, reptiles, birds and mammals are all animals.
Limestone : a white or light grey rock that is used as a building material and in the making of cement
Noun Limestone fragments and a few silicified grains (chert) are present, within a calcite spar cement.
Amphibian : an animal, such as a frog, that lives both on land and in water but must produce its eggs in water
Noun Salamanders, frogs, and other amphibian life are particularly sensitive to extreme pH levels.
Skunks : a small, black and white North American animal that makes a strong, unpleasant smell as a defence when it is attacked
Noun He was an oily, opportunistic skunk.
Prehistoric times : describing the period before there were written records
Adjective prehistoric man/humans/animals
Insect : a type of very small animal with six legs, a body divided into three parts and usually two pairs of wings, or, more generally, any similar very small animal
Noun Ants, beetles, butterflies, and flies are all insects.
mammal : any animal of which the female feeds her young on milk from her own body. Most mammals give birth to live young, not eggs
Noun Humans, dogs, elephants, and dolphins are all mammals, but birds, fish, and crocodiles are not.
Saber-toother cat : when a cat has very long teeth
Noun my cat has saber teeth
Earth : the planet third in order of distance from the sun, between Venus and Mars; the world on which we live
Noun The earth takes approximately 3651/4 days to go round the sun.