UNIT#1, pg. 100-101 3,4,6,8,11,12,14,16,20,22,24,26,30 3. Sample answer 1: A tree uses the energy in sunlight and carbon dioxide from the air to create food. It uses oxygen from the air for respiration. It absorbs water from the soil to carry out its life processes and anchors itself in the soil to remain upright. The Sun warms the air and soil so the plant does not freeze. Sample answer 2: A rabbit eats plants that use sunlight to make food. It uses oxygen from the air for respiration. The rabbit takes in water to carry out its life processes. It burrows in the soil to stay warm when temperatures drop. The Sun warms the air and soil to a tempera- ture that is warm enough for the rabbit to survive. 4. Possible answers include sunlight evaporating water or melting snow, wind blowing clouds across the sky, water wearing away rock or moving dirt, wind blowing sand, and sunlight warming soil. 6. Possible ecosystems and examples of plants and animals that live in each ecosystem are as follows: • Coastline and ocean—seaweed, plankton (microscopic plants), barnacles, mussels, starfish, rock crabs, cod, seals, whales, jelly- fish. • Freshwater ecosystem (pond, lake, river, bog)—willows, tamarack, aquatic plants, lake whitefish, sticklebacks, beavers, muskrats, ducks, geese, frogs, insects, snails. • Arctic—low shrubs, mosses, lichens, small flowering plants, caribou, wolves, arctic foxes, arctic hares, lemmings, migratory birds. 8. Producers are the only organisms that produce their own food from the abiotic environment, so consumers must depend on producers for food.
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