In Drosophila larvae there are two phenotypes, rover and sitters. The rovers expend more energy to find resources but have a fitness advantage as long as their frequency in the population is low. This is an example of which type of selection?

Apatient is in need of hydration. which type of solution are the patient's cells most likely in?

Sand spinifex grass is adapted to growing on sand dunes. it is a rapidly spreading plant and the creeping runners produce new root systems. which of these best explains the benefits of these features? a. it limits water loss through the leaves. b. it provides support by anchoring the plant. c. it protects the plant from predators. d. it allows the plant to tolerate salt. reset submit

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?