A star is a fusion reactor. Under enormous pressure, resulting from gravity, light nuclei of gases such as hydrogen merge to form helium, and since this process releases energy, the start begins to radiate the excess energy. Later on, helium fusion produces heavier elements, and so on.
Answer:
Natural selection acts on <u>individuals </u>which may result in the evolution of <u>populations.</u>
Explanation:
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Answer:
Publishing results of research projects in peer-reviewed journals enables the scientific and medical community to evaluate the findings themselves. It also provides instructions so that other researchers can repeat the experiment or build on it to verify and confirm the results.
Explanation:
Because we can’t tunnel down, so in order to study the interior layers, we must use indirect methods.
