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: 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
Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.

Question: Decreasing the mass of an object causes its inertia to 
 Answer: decrease
The full box is harder to move because it has greater mass and therefore greater inertia.

Question: Peter found a cool rock very deep below the surface of some dirt. He knew the rock was _____. 
 Answer: older

Fossils found at the lowest layer of rock would be the oldest, as these would have been buried for the longest time, whereas fossils found closer to the surface would be buried more recently and therefore be younger.