Biology

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Across
  1. 4. Any of the various analogous processes by which there is an exchange of gases.
  2. 7. The maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
  3. 10. Symbiosis that is beneficial to both organisms involved.
  4. 12. The process by which a substance goes directly from the solid to the gaseous state without passing through the liquid state.
  5. 13. An animal that naturally preys on others
  6. 14. Delayed part of the angiographic examination of a vascular bed, to show small artery patency.
  7. 15. (1) Of, pertaining to, or produced by life or living organisms (of an ecosystem).(2) Pertains to a living thing (such as plant, animal, fungus, etc.) as well as its products (e.g. secretions, wastes, and remains).
  8. 17. The process of giving off water vapour through the skin or mucous membranes; also sometimes referred to as sweating, which is the evaporation of water together with a small amount of sodium chloride via the sweat glands of the skin.
  9. 19. The passage of white blood cells through the endothelium and wall of small blood vessels.
  10. 20. A system that includes all living organisms (biotic factors) in an area as well as its physical environment (abiotic factors) functioning together as a unit.
  11. 21. An organism whose ecological function involves the recycling of nutrients by performing the natural process of decomposition as it feeds on dead or decaying organisms.
Down
  1. 1. An organism that feeds on detritus or organic waste.
  2. 2. The movement of organisms to a specific area, perhaps, for example, an upstream aquatic environment to further downstream.
  3. 3. A form of symbiosis in which one organism (called parasite) benefits at the expense of another organism usually of different species (called host). The association may also lead to the injury of the host.
  4. 5. A factor present in an environment that controls a process, particularly the growth, abundance or distribution of a population of organisms in an ecosystem.
  5. 6. An autotrophic organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy) or through chemosynthesis (using chemical energy).(2) The first trophic level in a food chain in which it serves as a food source for consumers or for higher trophic levels.
  6. 7. An association between two organisms in which one benefits and the other derives neither benefit nor harm.
  7. 8. An organism that generally obtains food by feeding on other organisms or organic matter due to lack of the ability to manufacture own food from inorganic sources; a heterotroph.
  8. 9. The synthesis of complex organic material using carbon dioxide, water, inorganic salts, and light energy (from sunlight) captured by light-absorbing pigments, such as chlorophyll and other accessory pigments.
  9. 11. The close external resemblance of an animal or plant (or part of one) to another animal, plant, or inanimate object.
  10. 15. (1) The part of the earth where living things exist.(2) The part of the earth (or planet) that is capable of supporting life.(3) The living things and their environment.(4) All of the ecosystems of the earth.
  11. 16. A contest between organisms, animals, individuals, groups, etc., for territory, a niche, or a location of resources, for resources and goods, mates, for prestige, recognition, awards, or group or social status, for leadership.
  12. 18. Nonliving, as in a factor, which is a nonliving physical and chemical attribute of a system, for example light, temperature, wind patterns, rocks, soil, pH, pressure, etc. in an environment.