In the scientific method, natural selection is classified as a

answer by yourhope:

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in which structure in the nucleus are ribosomes made?

b) nucleolus!

: )

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.