is there more water today than there was a million years ago? explain your answer.

Most likely there was more water on Earth a million years ago because the oceans formed about 3.8 billion years ago. Also, as the birth and death rates of organisms changed over a million years ago it must have affected the Earth's water "supply" having organisms use water to survive, and weather (rain) bringing in water. So, basically as time passed more organisms evolved and their needs evolved (adapt) such as the need of water- some needed less or more water depending on climate and adaptations- the growth of organisms and humans on earth must have slowly decreased the earth's water as we use so much of it. 

No there's not more water in 1 million years ago the earth maintains the same amount of water through the water cycle

Eukaryotic cells are theorized to have evolved from prokaryotes called the endosymbiotic theory. this explains that the most primitive eukaryotic cell engulfed a prokaryotic cell (by the process of phagocytosis) that is capable of cellular respiration and another prokaryotic cell that is capable of photosynthesis. these prokaryotic cells eventually became organelles and these organelles are the mitochondria and the chloroplast

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask