Rob is a biologist who is interested in native species conservation. To that end, he conducted two studies, case A and case B. In case A, a non native apex predator C was introduced in formerly apex predator D's habitat. In case B, same non native apex predator C was removed from formerly apex predator D's habitat. He now needs to analyze the results of these studies. Would predator D's trophic level increase or decrease in case A than in case B?
----
Answer: decrease

Martin is moving and he needs to make a ramp so he can load heavy furniture into his truck. He has a bad back, so he wants to use the least effort possible. Before he cuts the wood, he is trying to decide how long the ramp should be so he can move the heavy furniture easily. If Martin has enough materials for a long ramp will he need to exert a higher amount of effort or lower amount of effort?
----
Answer: lower

Dan studied two groups of individuals. Group S that had sickle cell anemia, and group B which had normal hemoglobin. He was fascinated by the results. Which group had more members that may inherit the gene from one parent and have sickle cell trait?
----
Answer:
Group S