Yes, there are many organisms that are composed of a single cell.
Recall that the first organisms were made up of single cells. Most organisms living today are single-celled. However, more and more species have developed more and more complex cells and structures over time.
There is no way to answer your question until we create a time machine. There were no people there, so no way to tell which was first. It is likely that it was a simple bacteria, but we do not know WHICH bacteria.
Likely, they were some sort of colony-organism, like Volvox today. Such organisms will exist as single cells for most of the time, but form colonies, aggregates of many thousands of cells, when under stress, for instance from predation or lack of food.
Yes, there are many organisms that are composed of a single cell.
Sponges, jellyfish, worms.
All organisms are made up of one or more cells. Organisms are a contiguous living system, such as plants and bacteria.
cells
All living organisms are made up of cells.
bacteria is still around and it was one of the first living organisms
1. All living organisms are composed of one or more cells. 2. The cell is the basic unit of structure, function, and organization in all organisms. 3. All cells come from preexisting cells.
Yes, organisms are made of one or more cells.
All organisms are made up of one or more cells. Organisms are a contiguous living system, such as plants and bacteria.
All organisms are made up of one or more cells. (Viruses are a special case; they are not made of cells but they are not really organisms, either.)
one or more cells.
cells
cells are cells, but a multicellular organism has more than one cell, though unicellular organisms have only a single cell.
One or more cells make up all living organisms.
No
Multicellular organisms.
it has more cells.
All living organisms are made up of cells.
bacteria is still around and it was one of the first living organisms