R-organisms reproduce at a very high rate. Knowing this, why don’t they usually reach their carrying capacity? a.
They live in environments with many predators that feed on them.
b.
They are regularly killed off by disease and/or drought.
c.
Their life span is too short.
d.
a and b only

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.