Capillaries are very thin, narrow blood vessels that allow for the transfer of oxygen, carbon dioxide, and nutrients. The image shows how normal red blood cells and sickle-shaped red blood cells flow through a capillary,
Use information in the image to describe two ways that the sickle cell gene mutation affects the ability of red blood cells to perform
their normal function

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

Ithink its because more have died recently than in the past.

The type of functional response expected of the eastern  kingbird in order  to increase insect prey abundance is the type ii functional response. this is characterized by a decreasing intake rate wherein it is assumed that the consumer is restricted by its capacity to process its food. in this regard, to increase insect prey abundance, the consumption of the eastern kingbird must decrease. 

The answer is vestigial structure.hope my answer has you : )