Answer:
Veterinary science deals with the health and wellbeing of animals
Y'know it’s basically a veterinarian.
Explanation:
PogChamp
I'm not sure that this is 400 words but this is what I came up with.
Answer:
White blood cells (WBCs) are a part of the immune system that helps fight infection and defend the body against other foreign materials. Different types of white blood cells are involved in recognizing intruders, killing harmful bacteria, and creating antibodies to protect your body against future exposure to some bacteria and viruses.
Explanation: