Dominate animals hunt the smaller and weaker animals for survival.
A robot moves but it is not alive.
The immune system. It produces antibodies which fight the bacteria or virus that caused the infection
The lining of the uterus is shed because an ovum has not been fertilized
The answer is tissue fluid. Tissue fluid holds far smaller quantity of protein molecules because they are too large to escape easily over the tiny holes in the capillary endothelium. Tissue fluid doesn't contain red blood cells because they are too large, but does comprise some white blood cells.
