In the 1800s, trains used coal to power steam engines. Which is the most accurate representation of energy transformations in the train's engine?

Newton's first law of motion states in part that an object in motion tends to stay in motion. Why is this law easier to observe if the object is in motion on smooth, level ice?

A white-colored fabric is dyed with a chemical that reflects red light and absorbs both green and blue light. Which color best describes how the fabric looks to the human eye?

A student is comparing the cells from a maple leaf with the cells of a group of single-celled organisms called paramecium. Which difference will the student most likely observe?

Which cell part is found in plant cells but not in animal cells?

All of the following organisms can reproduce asexually except

Which source will a thermotropic plant grow toward?

What do green plants produce that causes them to be classified as producers in an ecosystem?

Which allows for adaptations within a population that contribute to biological diversity over time?

Throughout Earth's history, most species that have lived are now extinct. Which was the basic cause of extinction for most of these species?

Which part of the water cycle occurs after condensation and before runoff?

The Himalayan Mountains, just north of India, are still increasing in height. Which type of tectonic plate movement forms mountain ranges like the Himalayas?

Which object produces energy in the form of light?

Which is the main cause of ocean tides?

Which human activity would be the best way to help prevent erosion on a barren hillside?

Which best describes the main purpose of science?

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