A substance that causes a mutation <<< apexx
It is any agent (such as, chemical) that is responsible for mutation, typically a genetic mutation.
A mutagen is a substance which increases the frequency of mutation in a plant or animal population, which can lead to a variety of consequences. When DNA is copied, damage can be caused by physical and chemical agents know as Mutagens
Caulerpa is the largest single Cell organism.
An unfertilized Ostrich egg is the largest single Cell;
Ovums are single Egg Cells.
Actually the largest single cell in the world is the giraffe neuron in a hind leg of the giraffe.
Most cells are transparent ... they must be dyed to be seen clearly. Although the chloroplasts are green in plant cells, and red blood cells are red.
They could have been two of triplets (or quads, or quints ... or more).