Retroviruses are unique in that they: a. replicate in nervous system cells. b. use RNA as a template to make DNA. c. do not have a capsid. d. use DNA as a template to make RNA.

this is a good question! i'll do some research and come back when i have the answer!

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.

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this