Producers are generally found at the beginning of a food chain. Which statement best explains why this is true?

A lion cub resembles its parents because it inherits genes that produce

If body temperature is too high, some blood vessels increase in size and sweat glands will excrete sweat, resulting in a lower body temperature. These changes are an example of

A farmer grows beans that he sells to local markets. Over a period of 40 years, the farmer has identifi ed the plants that produced the most beans and only used those beans to produce new plants. This procedure is part of the process of

Although we rely on coal, oil, and natural gas to produce energy, some environmental scientists have proposed that we use less fossil fuel. One reason to support this proposal is to

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What is the primary source of energy in this environment?

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The cellular structures referred to in this study are most likely

Which process must first take place in order for the proteins in foods to be used by body cells?

Which statement is characteristic of reproduction in humans?

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Which row in the chart below represents the most likely changes in the atmosphere due to widespread deforestation?

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