aerobic | enhancing respiratory and circulatory efficiency; depending on free oxygen or air |
anaerobic | living or active in the absence of free oxygen |
asexual reproduction | reproduction without the fusion of gametes |
asteroids | any of numerous small celestial bodies that revolve around the sun |
carbon cycle | a thermonuclear reaction in the interior of stars; the organic circulation of carbon from the atmosphere into organisms and back again |
cell organelles | specialized part of a cell; analogous to an organ |
chromosome | a structure in the cell nucleus that contains DNA |
density | thickness; quantity of something per unit measure, especially per unit length, area, or volume |
diffusion | act of dispersing or diffusing something |
gene | a segment of DNA that is involved in producing a polypeptide chain |
heredity | genetics; inheritance; genetic transmission of characteristics from parent to offspring |
homeostasis | metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes |
meiosis | cell division that produces reproductive cells in sexually reproducing organisms |
mitosis | cell division in which the nucleus divides into nuclei containing the same number of chromosomes |
organ | natural part or structure in animal or plant, capable of performing some special action |
organisms | discrete and complete living thing, such as animal, plant, fungus or microorganism |
osmosis | diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal |
photosynthesis | chemical combination brought about by the action of light |
qualitative change | changes in kind or type |
quantitative change | an alteration in the number |
respiration | breathing; process of inhaling and exhaling; oxidative process occurring within living cells |
sexual reproduction | reproduction involving the union or fusion of a male and a female gamete |
species diversity | the variety of species in a given region or area |
tissue | groups of cells that make particular parts of the body; soft thin paper |
transpiration | the process of giving off or exhaling water vapor through the skin or mucous membranes; the emission of water vapor from the leaves of plants |
transport | carry from one place to another; carry away; deport |
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