Answer:
Heat from the sun travels to earth by Electromagnetic Radiation.
There are many answer you have to be specific
Amino acids are essentially the "building blocks" of proteins. You could think of it as an individual amino acid combining with others to form a link or stand.
Answer:
(a) Allow movement in only one plane/direction (that is extension or flexion)
(b) The skeletal system also produces blood cells in their bone marrow
