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: If a dog is extremely unfit and unhealthy breeders will want it to have 
 Answer: less offspring
Genotypes with greater fitness produce more offspring and pass more copies of their alleles to the next generation.

Question: If John increases the rate at which gas exits the bottom of his rocket, what will happen to the upward momentum of the rocket? It will 
 Answer: increase
The rocket goes upwards because the hot gases shoot downwards out of the nozzle. The faster the gases go downwards, the faster the rocket goes upwards.

Question: Simon was digging in his yard and found that the rocks that were shallower in the ground, compared to the surface rocks, were likely 
 Answer: younger

Therefore, deeper rock layers must be older than layers closer to the surface.