12. A group of elements that has two electrons in its outer energy level is the
a. alkaline earth metals
c. alkali metals
b. halogens
d. actinides

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

not sure if this what   you'r looking for would be percent composition

i got you i did it ya know what it is just needing to fill this in for a quick task!

segmented body, an exoskeleton made from chitin, and joint appendages.