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.

[Q]: Question: Tasha is studying birth rates in various countries. She looks at two countries. In South Africa, the food supply is currently higher than in Australia. Because of this, the birth rate in South Africa, compared to Australia, will be 
 Answer: higher
[A]: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.


[Q]: Question: Dean found a leaf with a sheen and a leaf that did not have one. Which leaf is less reflective? 
 Answer: the leaf with no sheen
[A]: Increases the sheen on leaves to make them more reflective.


[Q]: Question: David turns down the temperature in the cabin, so energy of sound waves is moving 
 Answer: slower
[A]:
At a lower temperature, particles of the medium are moving more slowly, so it takes them longer to transfer the energy of the sound waves.