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.
Ideal Age. The best time to adopt a puppy is usually between 8 and 16 weeks. This is an ideal time to introduce him to new places and people. That is, unless you have small children.Then you may want to wait until the pooch is around 5 months old.efore taking the plunge, consider a few things. An 8- to 16-week-old puppy needs lots of attention. You canât just lock him in a crate or small apartment all day and expect him to be happy and thrive. This is the time when he becomes house-trained and learns other household etiquette.