Cyanobacteria which is a type of algae. It conducts photosynthesis and without it there may not have been life today because they didn't need oxygen to survive and in order to have oxygen there had to have been some form of life...
Proteins are made up of a series of amino acids. Nucleic Acids (RNA and DNA) are made up of a series of nucleotides.
you really did not know this???
The answer would be C, The rising of global temperatures, why?
Well, global warming means that the worlds temperature is rising.
So, rising global temperature is solid evidence the world is warming up.
Hope this helped! c:
