The spot where your optic nerve connects to your retina has no light-sensitive cells, so you can't see anything there. That's your blind spot.
The number of cases of a disease in a specific population at a particular timepoint or over a specified period.
(I believe this is the answer!)
For this i would say either C or D but leaning more towards C.
An example of a first class lever in the human body is the head and neck during neck extension. The fulcrum (atlanto-occipital joint) is in between the load (front of the skull) and the effort (neck extensor muscles). The muscles are attached to the posterior part of the skull to allow for the greatest effort arm.
