10points !
which phrase best describes dna?
a. the structure that sends signals to other parts of the cell
b. the molecule that contains all the instructions for life
c. the molecule that is formed by the action of rna
d. the structure directly responsible for controlling osmosis

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.

you know they are heterozygous for a trait because they have it as jj or jj.