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.
Bringing a puppy home at 8 weeks gives you just 4 weeks to do this, bringing one home at 10 weeks gives you only 2! Bringing the puppy home at 12 weeks means youâve missed this critical period and socialization will now be much harder than it ever should have been.f a breeder tries to convince you to take the puppy home before 8 weeks, itâs usually for selfish reasons such as financial savings and not wishing to invest time into care and socialization. So be very suspicious of the breeder if this is their wish.