In what way are the humerus and the femur similar?
a-they both attach their respective limbs to the axial skeleton.
b-they both have similar joints at the end.
c-they both are extremely long and made of compact bone.
d-they both have hollow space is filled with bone generating cells.
e-they both protect vital organs.

A.  The humerus and femur are the bones of the appendicular skeletal system.

They both attach their respective limbs to the axial skeleton

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.