B. Objectives project.
<h2>#Continuar aprendiendo</h2>
Answer:
These are things that won't be going away. Natural gasses and fossil fuels will likely run out someday or become much harder to find. When you use these sources of energy, they won't be going away and therefore will be sustainable because we can always continue using them.
Does that make sense?
Explanation:
C. Protective over young cubs
True.
After forming a hypothesis, or an explanation that would be experimented on, you would be <em>testing</em> it to see if it gives the results you were looking for.
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The answer would most likely be D. Mass Extinction
