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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 identified 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*
The diagram below represents relationships in an ecosystem.
What is the primary source of energy in this environment?*
Research has shown that treadmill training increases the number of certain energy-releasing structures in the brain cells of rats.
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?*
Which row in the chart below represents the most likely changes in the atmosphere due to widespread deforestation?
The chart below represents some of the events
that occur during the cycling of nutrients in an ecosystem.
Which organisms would most appropriately complete the chart when written in the circle at X?*
The diagram below represents the formation of a cancerous growth.
Which statement best explains the events represented in this diagram?*
A standard laboratory technique used to produce a new plant is represented in the diagram below.
This technique is best identified as*
An example of competition between members of two different species is*
Which statement best explains why different body
cells of the same individual look and function differently?*