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: Dean wants his solution to be as acidic as possible, so his concentration of hydrogen ions will be 
 Answer: higher
With a higher concentration of hydrogen ions, a solution is more acidic but has a lower pH.

Question: When a device become less efficient, its production of usable energy will go 
 Answer: down
The more efficient a device is, the greater the percentage of usable energy it produces.

Question: Plants grow more poorly in the tundra because it is 
 Answer: colder

The warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering.