Answer:
the actual answer is B
Explanation:
The form of energy most responsible for giving us sunlight is nuclear energy. The sun produces energy through nuclear fusion in its core.
Answer:
4.54 billon years
Explanation:
the earliest time that life forms first appeared on Earth is at least 3.77 billion years ago possibly as early as 4.28 billion years
Answer: A specific chemical binding to nociceptors
Explanation:
Answer:
E. Variations in Earth's orbit occur gradually over 100,000 years.
