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Across 1. An animal that does not actively adjust to its internal osmolarity because it is isotonic with its environment. 5. In classification, the taxonomic category above family. 6. A group of organs that work together in performing vital body functions. 2 Words 7. The study of carbon compounds. 2 Words 9. A specialized center of body function composed of several different types of tissues. 10. The development of organ rudiments from the three germ layers. 13. A measure of the tendency of a solution to take up water when separated from pure water by a selectively permeable membrane. 2 Words 14. In prokaryotic DNA, a sequence of nucleotides near the start of an operon to which an active repressor can attach. 15. The diffusion of water across a selectively permeable membrane. 17. A large opening in a sponge that connects the spongocoel to the environment. 18. A heterotrophic animal that consumes both meat and plant material.

Down 2. An arrangement of internal transport in which blood bathes the organs directly and there is no distinction between blood and interstitial fluid. 3 Words 3. Bone-forming cells that deposit a matrix of collagen. 4. Microorganisms that are normal residents of a host but can cause illness when the host's defenses are weakened by such factors such as poor nutrition or a recent bout with the flu. 5. The mouth of an animal. 2 Words 6. The control of water balance in organisms living in hypertonic, hypotonic, or terrestrial environments. 8. An arrangement of the fingers such that the thumb can touch the ventral surface of the fingertips on all four fingers. 2 Words 11. One of several formed bodies with specialized functions, suspended in the cytoplasm of eukaryotic cells. 12. Solute concentration expressed as molarity. 16. A unit of genetic function common in bacteria and phages, consisting of coordinately regulated clusters of genes with related functions.