What makes both plants and solar panels sources of renewable energy?

Plants and solar panels are both considered sources of renewable energy primarily because they harness energy from the Sun. Plants use a process called photosynthesis to convert sunlight into chemical energy, which they store as sugars and other organic compounds. This energy can then be utilized by the plant and the organisms that consume it. Similarly, solar panels capture sunlight and convert it into electrical energy through photovoltaic cells. This reliance on solar energy creates a sustainable cycle, as the energy from the Sun is readily available and will continue to be produced for billions of years.

In contrast, the other options do not accurately reflect the characteristics of renewable energy. Options mentioning the need for rare materials, operation during the day, or dependence on fossil fuels misrepresent the nature of renewable energy sources, which are defined by their ability to produce energy continuously without depleting resources or causing significant environmental impact.