Living in Water

12345678910111213141516171819202122232425262728
Across
  1. 2. a process used by plants, algae, and many species of bacteria to convert energy captured from the sun into chemical energy that can be used to fuel the organism’s activities.
  2. 3. an animal that lives by capturing and eating other animals.
  3. 4. an animal that is eaten by a predator.
  4. 7. The process of transformation from an immature form to an adult form in two or more distinct stages.
  5. 12. an organ running lengthwise down the sides of fish, used for detecting vibrations and pressure changes.
  6. 16. the juvenile stage of development of certain insects.
  7. 17. water that has more salinity than freshwater, but not as much as saltwater.
  8. 19. biological sonar used by several kinds of animals where the animal makes sounds and listens to the echoes of those sounds that return from bouncing off objects near them.
  9. 22. without color; appearing transparent, translucent or white.
  10. 23. a respiratory organ that enables aquatic animals to take oxygen from water and to excrete carbon dioxide.
  11. 24. how an organism is built; the internal and external physical features that make up an organism. These features include shape, body covering and internal organs and can determine how an organism interacts with its environment.
  12. 25. how an organism acts and reacts in response to its environment, distinguishing one individual or species from another.
  13. 27. a physiological adaptation of many organisms that allows them to regulate their intake of salts or fresh water to keep their fluids, such as blood, from becoming too salty or too dilute.
  14. 28. a type of algae encased within a cell wall made of silica; most are single-cell, but many can form colonies.
Down
  1. 1. cells that can be scattered along the outside surface of fish that function as taste receptors.
  2. 5. the newly hatched form of many fish, insects, or other organisms that have a distinct separate life stage before metamorphosis, or change, into adults; wingless, often wormlike form of many insects before metamorphosis that have no wings and cannot reproduce.
  3. 6. animal plankton, including single-celled and complex multicellular organisms.
  4. 8. the bottom of a stream or river channel.
  5. 9. organisms that have internal body temperatures at or near the same temperature as the environment in which it lives.
  6. 10. a group of aquatic organisms ranging from single cell to multicellular that generally possess chlorophyll and are photosynthetic, but that lack true roots, stems and leaves characteristic of terrestrial plants.
  7. 11. a wing- or paddle-like part of a fish used for propelling, steering, or balancing in the water.
  8. 13. the upper layer of water in a lake or ocean that is exposed to sufficient sunlight for photosynthesis to occur; also called the photic zone.
  9. 14. any of the small, stiff, flat plates that form the outer body covering of most fish.
  10. 15. microscopic free-floating living organisms not attached to the bottom or able to swim effectively against most currents.
  11. 18. the external skeleton or covering that supports and protects an animal’s body.
  12. 20. characteristics of an organism that allow it to do special things, such as secrete slime, as well as characteristics that allow it to function within its environment, such as regulate temperature and balance salts in internal fluids.
  13. 21. a behavior or physical trait that evolved by natural selection and increases an organism’s ability to survive and reproduce in a specific environment.
  14. 26. bladder an air-filled sac near the spinal column in many fish species that helps maintain the fishes’ position in the water column.