(I'm not sure but i think these are the answers)
composed of one or more cells
contains genetic program
acquires and uses energy
-Surface area to volume ratio. (surface area / volume)
-Nucleo-cytoplasmic ratio.
-Fragility of cell membrane.
-Mechanical structures necessary to hold the cell together (and the contents of the cell in place)
Because it's lighter, flexible, and lastly it's easily to heal. Hope this helps! :D
Bacteria decomposes other things.
Around 4.1 billion years ago the first single celled organism appeared
