In which of the following way(s) can a person contract HIV? from sexual intercourse.
from contact with blood contaminated with HIV.
from a plate used by someone with HIV
from a mosquito bite.
from a public swimming pool.
from HIV contaminated donated blood.

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.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.