The answer is plants. Plants are at the start of the food chain :)
The chemical formula would be
CTGA or any of the combinations of the four nitrogenous bases
The nucleotide is made up of four bases which makes it a tetranucleotide and the arrangement of each bases create a linear geometry.
It depends on how old you are.
A tree is considered living because it takes in nutrients like other living things. The tree is also made up of cells which all living things are made up of. Trees can also produce offspring. Just like any other living thing.
Answer:
Much change is due to random genetic drift rather than positive selection. Some are harmful and are likely to be eliminated by natural selection – by death of the embryo, for instance. ...
