|
| Amnion | n. | innermost membrane of the sac enclosing the embryo of a mammal, reptile, or bird |
| Amylase | n. | enzyme found in saliva and in the pancreatic juice and that acts on starch and other substances contained in the food we eat |
| Aorta | n. | main artery of the body, carrying blood from the left ventricle of the heart to all the main arteries |
| Barnacle | n. | small marine crustacean that attaches itself to rocks and ships |
| Bile | n. | juice secreted by the gall bladder |
| Billion | n. | a thousand millions |
| Bronchi | n. | any of the major air passageways of the lungs; esp., either of the two main branches of the trachea, or windpipe |
| Browse | v. | tp feed on tender shoots, twigs or leaves of trees |
| Camouflage | v. | to disguise, false pretense |
| Carnivorous | adj. | flesh eating; insect-eating |
| Catalyst | adj. | substance that initiates a reaction and enables it to take place under milder conditions |
| Central | adj. | in or near the center |
| Cerebellum | n. | section of the brain behind and below the cerebrum |
| Cerebrum | n. | upper, main part of the brain of vertebrate animals |
| Color adaptation | n. | change of color to blend with nature as concealment, or to warn |
| Compound | n. | (eye) an eye made up of numerous simple eyes functioning collectively, as in insects |
| Cud | n. | swallowed food brought up for rechewing by a ruminant |
| Dendrites | n. | neurons that carry impulses towards the cell body |
| Enzyme | n. | substance that acts as a catalyst in metabolism |
| Epiglottis | n. | thin cartilage behind the tongue that moves upward to cover the glottis, the cavity that lets air pass to the lungs, to avoid food going through the wrong canal |
| Fetus | n. | unborn young of an animal while still in th uterus or egg |
| Graze | v. | to feed on growing grass or herbs |
| Herbivorous | adj. | feeding chiefly on grass or other plants |
| Hibernate | v. | sleep through the winter |
| Insulin | n. | juice secreted by the pancreas |
| Invertebrate | adj. | not vertebrate; having no backbone, or spinal column |
| Lymph | n. | clear, yellowish fluid resembling blood plasma found in intercellular spaces and in the lymphatic vessels of vertabrates |
| Magnetic field | n. | region subject to the influence of magnetism (attraction or rejection) |
| Medulla | n. | inner substance of an organ, as of the kidney, adrenal gland, etc |
| Mimicry | n. | superficial resemblance that some organisms exhibit to other organisms to secure protection or other advantage |
| Nephron | n. | single urinary tubule in the vertabrate kidney |
| Neurons | n. | cells that make up the brain and spinal cord |
| Omnivorous | adj. | eating any sort of food, exp. both animal and vegetable food |
| Osmosis | n. | tendency of liquids to pass through porous partitions and become diffused |
| Peripheral | adj. | belonging to or forming a periphery; lying at the outside or away from the central part |
| Peristalsis | v. | to surround, involve the rhythmic, wavelike motion of the walls of the alimentary canal and certain other hollow organs |
| Pheromones | n. | chemicals that help externally to regulate an animal's environment by influencing other animals of the same species |
| Placenta | n. | vascular organ, developed within the uterus of most mamals during gestation from the chorion of the embryo and a part of the maternal uterin wall |
| Predator | n. | animal that preys or eats other animals |
| Prey | n. | victim; an animal killed by another for food |
| Reflexes | n. | movement performed automatically, involuntarily, in consequence of a nervous impulse |
| Phytoplankton | n. | plankton consisting of plant life |
| Plankton | n. | group of minute plants and animals that float in the ocean |
| Species | n. | seeing, appearance, shape, kind or quality |
| Symbiotic Relationship | n. | living together, or close union, of two different organisms with mutual benefits for both |
| Trachea | n. | in the respiratory tract of most land vertabrates, the tube extending from the larynx to the two bronchi |
| Umbilical Cord | n. | tough, corlike structure connecting the naval of a fetus to the placenta and serving to supply nourishment to and remove waste from the fetus |
| Urea | n. | substance found in urine |
| Ureter | n. | duct or tube that carries urine from a kidney to the bladder or cloaca |
| Ventricle | n. | sny of various cavities or hollow organs |
| Vertebrate | adj. | having a backbone, or spinal column |
| Zooplankton | n. | plankton consisting of animal life |