Carry: Comb. form, 4 letters
Attractive substance, 9 letters
A chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species, 9 letters
Substances released by animals that influence other members of the same species, 10 letters
A procedure in which blood is drawn and separated into its components by dialysis, 8 letters
Some are retained and the rest are returned to the donor by transfusion, 8 letters