notochord - flexible, rod-like structure found in the embryo of all chordates, vertebrae - a set of interlocking bones that form the backbone of a vertebrate, vertebrates - have a backbone and skull, epithelial tissue - made up of closely packed cells in one or more layers, connective tissue - provides strength, support, and protection of soft body parts, ectotherms - animals that are not able to control their body temperature, endotherms - animals that use heat produced by chemical reactions in their cells to maintain a constant body temperature, external fertilization - the female lays eggs and the male deposits sperm on the eggs, internal fertilization - the male deposits sperm inside of the female, lateral line system - rows of sense organs along each side of a fish that detect vibrations, gills - organs that extract oxygen from water and remove carbon dioxide from the blood, lung - a sac-like organ that takes oxygen from the air and transfers it to the blood, amniotic egg - an egg that is surrounded by a shell to prevent it from drying out, mammary glands - organs that make milk, placenta - an attachment to the uterus that provides food and oxygen from the mother's blood to the embryo , therapsids - extinct group of reptiles from which mammals evolved, cornea - part of the eye that, along with the lens, refracts and focuses light, retina - a thin layer of cells in the back of the eye that converts light into nerve signals, optic nerve - a nerve that transmits signals from the eye to the brain,

Gr 7 Science Chapter 17.3

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