We are eukaryotic cells. We have a nucleus and many organelles. We can be unicellular or multicellular. We have evolved from prokaryotes, yet are way more complex. We have cytoskeletons and go through a process called mitosis. I am commonly known to be in plants and animals, but make fungi and protists also.
I am a prokaryotic cell. I have been on Earth for over hundreds of millions of years. I am very simple and create clones of myself. I am single-celled. A nucleoid is contained in me. I am usually just known as bacteria. DNA is mostly curved, not straight.