1) Some dinosaur fossils have structures that look like wings, what might you infer about these animals? a) They lived in water b) They could fly c) They were large d) They were fish 2) Competition is a struggle for resources. Which three resources do living things compete for? a) food, water and space b) food, water and air c) food, water and fuel d) space, air and fuel 3) What would happen if prairie dogs were removed from a grassland? a) Rabbits would have more places to make their homes b) Coyotes would have more food c) Eagles would have less food d) The soil would have more nutrients 4) Which environmental change is too slow to notice? a) spiders spinning a web across leaves b) birds gathering materials and building a nest c) bacteria breaking down leaves d) a squirrel hiding an acorn 5) What will happen on the forest floor if trees are cut down? a) There will be no change b) Animals will not notice a change c) New plants will grow in the sunlight d) roots of vines will grow up the new trees 6) Which one of these is an example of a present-day animal and an ancient animal that look alike? a) a mammoth and a tiger b) a hummingbird and an eagle c) an elephant and a mammoth d) a dragon and a lizard 7) All the living and nonliving things that share an environment are part of an . . . . . a) community b) competition c) extinct d) ecosystem 8) When living things struggle for the resources they need, . . . . . . . . occurs. a) competition b) community c) population 9) A . . . . . . of prairie dogs can be found in some prairie ecosystems. a) extinct b) population c) proportion d) pollution 10) When harmful materials get into air, water or land. a) dirt b) gas c) pollution d) soil 11) A . . . . . is the remains of a living thing that lived long ago. a) fossil b) bone c) rock d) fossicle 12) Fossils are found in . . . . a) fedimentary rock b) sedimentary rock c) regimentally rock d) detrimentally rock 13) All the living things in an ecosystem make up a . . . . a) continental b) continuity c) communal d) community 14) When all the individuals of an organism die out, it becomes . . . . a) accent b) extinct c) upset d) recycle 15) When you make something new from old things, you . . . . a) reckless b) bicycle c) recycle d) reconsider

Grade 4 Science 12 Ch3 Review

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