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: In ancient times, there was worse medicine. This means there was a _____ death rate. 
 Answer: higher
More recently, the death rate has fallen because of the availability of more food and medical advances.

Question: When Sarah wants to lower the amount of electrons that are there, she will use energy at amounts that are 
 Answer: lesser
Less energy is also needed to remove electrons from larger atoms in the same group of the periodic table.

Question: If Jim lengthens the wavelength of the electromagnetic waves his machine is producing, what happens to the energy output? 
 Answer: it decreases

Electromagnetic waves with shorter wavelengths have higher frequencies and more energy.