|
What question did the scientists who collected this data want to answer? a. Are there more earthworms in the soil in the spring than in the fall? b. What is the effect of plowing soil on the number of earth worms? c. How is the size of the earthworms affected by the seasons? d.Does plowing the soil affect how fast earthworms grow? Break It Down Students in Ms. Lee's class are studying the processes of weathering. The steps for their investigation and the data they collected are shown below. Steps: 1. Use a permanent marker to label four limestone rocks 1–4. 2. Measure the mass of each rock and record the data in a table. 3. Place the rocks in a plastic jar that is three-fourths full of water. Screw the lid on tightly. 4. Shake the jar vigorously for 10 minutes. 5. Remove the labeled rocks from the jar with a large spoon. Leave behind any pieces that have broken off. 6. Dab the rocks dry with a towel. Measure the mass of each rock again. 7. Pour the liquid that remains in the jar through a coffee filter and observe the sediment. Judith Miles: Student Space Scientist In the early 1970s a high school student named Judith Miles wrote to the National Aeronautics and Space Administration (NASA). Judith wondered if spiders would spin the same kinds of webs in space as on Earth. NASA scientists decided to do Judith's experiment and send two spiders into space. They would compare these against a control group of spiders on Earth. In 1973 two spiders were each fed a housefly and then launched into space aboard Skylab, an experimental space station. The spiders were in a specially made cage. A camera took pictures of the spiders as they built their webs. It took two days before one of the spiders began weaving a web. The first webs were poorly constructed. However, both spiders soon made webs almost identical to the webs made by control spiders on Earth. The diagrams below show a comparison of spider webs. Which question was Judith most likely trying to answer with her experiment? A. Why do houseflies become tangled in a spider's web? B.What amount of time does it take a spider to spin a web? C. Will weightlessness affect a spider's ability to construct a web? D. What kinds of insects get caught in spider webs constructed in space? |