TASK DEFINITION: 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.
PROBLEM: Question: If there were less dissolved carbon dioxide in ocean water, the ocean's rate of acidity would 
 Answer: decrease

SOLUTION: With higher levels of dissolved carbon dioxide in ocean water, the water becomes more acidic.

PROBLEM: 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

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

PROBLEM: Question: As we dig shallower into rocks they get 
 Answer: younger

SOLUTION:
Lower rock layers were laid down earlier, so they are assumed to contain older fossils.