"Like living things, viruses contain protein and genetic material. But viruses don't act like living things. They can't eat, grow, break down food, or use oxygen.", description, "Dennis lowered collecting bottles on ropes. The first water samples the scientist collected showed that some of the lakes were completely dead. Just a few weeks later, Dennis used microscopes to look at new water samples he had collected from the same lakes.", sequence, "Earth is surrounded by an atmosphere that protects all the plants and animals on the planet from the extreme conditions in space. Mars, too, has an atmosphere, but it is very different from Earth's.", compare and contrast, "When sound waves hit an object, some of them bounce back toward their source. This bounce is an echo. Some animals use this echo effect to help them survive. This is called echolocation. The bouncing sounds help the animals "see.", cause and effect, "Although human eyes cannot sense infrared, there are ways of detecting it. One is to use film that senses infrared.", problem and solution

Text Structures in Science

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