In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Question: Reid notices no change in the weather and temperature from 100 years ago. This likely was caused by _____ greenhouse gas levels.
Answer: decreased
As greenhouse gases increase, changes will be more extreme.

Question: If an animal is able to eat food more difficult is it more or less likely to reproduce?
Answer: less
Natural selection is the process by which living things with beneficial traits produce more offspring, so their traits become more common over time.

Question: Allie looks for sunscreen at the store. She sees SPF 30 and SPF 100. Which likely protects her skin worse?
Answer: SPF 30
A sunscreen with a higher SPF value protects the skin longer.