Due to high cellular activity and a proportionately high surface area, the very young child has a high basal metabolic rate. Year by year this rate decreases and then accelerates around adolescence, after which it again declines to the adult level.
It is a recognized fact that human milk is the best food for infants and will meet the nutritional requirements early in life up to three months when it is supplied in sufficient quantity.
The plants are grouped into two major categories based on their ability to prepare or obtain food. Autotrophic plants include green plants which can prepare their own food and can live independently. From inorganic raw materials, like carbon dioxide and water they can photosynthesize with the help of chlorophyll pigments in the presence of sunlight.