1. The lymphatic and cardiovascular systems include a network of capillaries and vessels that assist in circulation. These capillaries when present tin network forms capillary bed. So the correct answer is option A.
2. This statement is true. When Complement system works as a defense system, it releases lytic enzymes which damages the plasma membrane of the pathogenic agent.
3. The 1st line of defense. It includes the physical and chemical barriers. They doesn't allow the pathogens to enter inside the body.
The only Intimate linking relationship between the lymphatic and the cardiovascular system is through the capillary...