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Life Science Vocabulary A-C (not all of "C")

Across
A protein made in response to a specific antigen that can attach to the antigen and cause it to be useless.
Elastic, muscular organ that holds urine until it leaves the body through the urethra.
Nonliving, physical features of the environment, including air, water, sunlight, soil, temperature, and climate.
Part of Earth that supports life, including the top portion of Earth's crust, the atmosphere, and all the water on Earth's surface.
An alternate form that a gene may have for a single trait; can be dominant or recessive.
Nutrient that usually is the body's main source of energy.
Microscopic blood vessel that connects arteries and veins, has walls one cell thick, through which nutrients and oxygen diffuse into body cells and waste materials and carbon dioxide diffuse out.
Forceful behavior, such as fighting, used by an animal to control or dominate another animal in order to protect young, defend territory, or get food.
A type of reproduction--fission, budding, and regeneration--in which a new organism is produced from one parent and has DNA identical to the parent.
Lung disorder in which the bronchial tubes contract quickly and cause shortness of breath, wheezing, or coughing; may occur as an allergic reaction.
Largest number of individuals of a particular species that an ecosystem can support over time.
Any organism that is able to live without oxygen.
Flowering vascular plants that produce a fruit containing one or more seeds; monocots and dicots.
Tough, flexible tissue that joins vertebrae and makes up all or part of the vertebrate endoskeleton.
Large geographic areas with similar climates and ecosystems; includes tundra, taiga, desert, temperate deciduous forest, tropical and temperate rain forest, and grassland.
Down
Theory that living things can come only from other living things.
Overly strong reaction of the immune system to a foreign substance.
The way in which an organism interacts with other organisms and its environment; can be innate or learned.
Connects the brain to the spinal cord and is made up of the midbrain, the pons, and the medulla.
Blood vessel that carries blood away from the heart and has thick, elastic walls made of connective tissue and smooth muscle tissue.
Disease-carrying organism, such as a mosquito, or fly, that spreads infectious disease.
Chemicals produced by some bacteria that are used to limit the growth of other bacteria.
Any variation that makes an organism better suited to its environment.
Building blocks of proteins.
Striated, involuntary muscle found only in the heart.
Substance that causes an allergic reaction.
Protective outer covering of all cells that is made up of a double layer of fatlike molecules and regulates the interaction between the cell and the environment.
Form of asexual reproduction in which a new, genetically identical organism forms on the side of its parent.
Jointed structures of arthropods, such as legs, wings, or antennae.
Features of the environment that are alive or were once alive
Vascular tissue that produces xylem and phloem cells as a plant grows.
Neuron structure that carries messages away from the cell body.
Smallest unit of a living thing that can perform the functions of life; has an orderly structure and contains hereditary material.