Rh factor is an antigen found on the surface of red blood cells. Red blood cells with the antigen are said to be Rh positive, while those without are said to be Rh negative. Blood used in transfusions must match the donor and recipient's Rh and ABO blood type as Rh negative patients will develop anemia when given Rh positive blood. <span />
Yeah they have :) pretty sure
Well certain regions have different amounts of everything and
Carrying capacity is the number of individuals of one species that an ecosystem can support So
1) water could increase it
2) food could increase it
3) the the sunlight could or could not increase it you would have to look this one up but I'm pretty sure it will so hope I helped you in any way
C. Xylem moves water up, and phloem moves food down