long-chain of hydrocarbon with single covalent bonds in the carbon chain; the number of hydrogen atoms attached to the carbon skeleton is maximized.

reptile or bird

flat, triangular bone located at the posterior pectoral girdle

mechanical or chemical processes to soften the seed coat

coelom formed by groups of cells that split from the endodermal layer

during development of protostomes, a solid mass of mesoderm splits apart and forms the hollow opening of the coelom

mental disorder characterized by the inability to accurately perceive reality; patients often have difficulty thinking clearly and can suffer from delusions

glial cell that creates myelin sheath around a peripheral nervous system neuron axon

the part of a plant that is grafted onto the root stock of another plant

plant cell that has thick secondary walls and provides structural support; usually dead at maturity

 cell that secretes silica spicules into the mesohyl

sac containing testes; exterior to the body

type of cotyledon found in monocots, as in grass seeds

in mammals, a skin gland that produce a lipid mixture called sebum

small, non-protein molecule that propagates a signal within the cell after activation of a receptor causes its release