Water & Nutrients. Like humans and animals, plants need both water and nutrients (food) to survive. Most all plants use water to carry moisture and nutrients back and forth between the roots and leaves. Water, as well as nutrients, is normally taken up through the roots from the soil.
Changing from puppy food to adult food depends on the size of your dog as an adult. If he is a small breed and will not exceed 30 pounds, he is mature at 10 to 12 months old. Some small breeds are mature before 10 months of age. Medium breeds are dogs that do not exceed 80 pounds at full growth.
Majority of people consider a one-year-old puppy to be an adult, however, not all dog breeds mature at the same rate and not all pooches are full grown on their first birthday. Typically, smaller breeds reach their size more quickly than larger breeds. In fact, some larger breeds may not be fully grown until around 2 years of age. This is important to know since pups need special nutrition until they are fully mature, in order to grow properly and become healthy adults.