Answer:
A gene is a section of a double-stranded molecule known as DNA. This molecule is found within the nucleus of the cell, contained in threadlike structures called chromatin. The two strands form a double helix linked by a series of paired bases. The base adenine is always linked to thymine and the base cytosine is always linked to guanine.
Because all organisms are made up of cells and there are different types of cells which carry different functions.
Water or sunlight Our bodies made 90% of water and the sunlight give u Nutrients
