Nerve cells is the correct answer :)
The natural water sample contains only one type of bacteria.
They are formed by natural processes like anærobic decomposition. They contain energy from ancient photosynthesis. They can literally be around 650 million years old.
Genes" is the one among the following choices given in the question that we call these units of hereditary information today. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that you were looking for and the answer has actually come to your desired help.
Help ease people through the withdrawal process.