The cells of the innate system recognize and respond to pathogens in a generic way, but, unlike the adaptive immune system (which is found only in vertebrates), it does not confer long-lasting or protective immunity to the host.ll white blood cells (WBC) are known as leukocytes. Leukocytes are different from other cells of the body in that they are not tightly associated with a particular organ or tissue; thus, they function similar to independent, single-cell organisms.
Ideally, the age to bring home a puppy is when heâs between seven and twelve weeks old. This is considered the critical socialization period in a puppyâs life, the time when he learns the most about his environment and begins to adjust to his surroundings.
Experts recommend that you begin house training your puppy when he is between 12 weeks and 16 weeks old.At that point, he has enough control of his bladder and bowel movements to learn to hold it.f your puppy is older than 12 weeks when you bring him home and heâs been eliminating in a cage (and possibly eating his waste), house training may take longer. You will have to reshape the dog âs behavior -- with encouragement and reward.