Produce antibodies against anything with a RH positive, or different blood type. Which when the antibodies attack to different blood can cause blood clots, which could be fatal.
Pioneer species. They are the usually the first to grow after an ecosystem has been destroyed(in this case by flood).
Answer: genetic variation
The right answer for the question that is being asked and shown above is that: (1) removing metabolic wastes from the body; (2) urea is not soluble in water; (3) simple diffusion across the skin; (4) They both actively pump salt across their gills; (5) <span>They both produce lots of diluted urine."</span>