Elements of the same group all--

The atomic number of an elements represents the number of --

N is the symbol for Nitrogen, H is the symbol for Hydrogen, and Cl is the symbol for Chlorine. The chemical formula NH4Cl indicates there are--

Groundwater and surface water are both sources of water for communities. A community prevents contamination of surface water by

According to Modern Atomic Theory, the area around the nucleus is referred to as the--

The plant is undergoing photosynthesis, which requires radiant energy. What is the source of the radiant energy?

Organic compounds contain carbon and other elements such as--

When people remove vegetation from the land, they accelerate the processes of runoff and--

Which factor will help maintain stability in an ecosystem?

Scientists think that life may have existed on Mars. Which discovery on Mars best supports this theory?

A farmer's garden burned down and was left alone for ten years. Which description indicates that the garden is currently undergoing secondary succession?

Fish gills are an adaptation that allow fish to live in water. This adaptation allows them to--

Charles Darwin observed how the beak sizes of Medium Galapagos Ground Finches have changed size over generations. This phenomena is evidence of--

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