Source: www.reefcorner.com

How many cells do you think this thing has?

a.  100,000

b.  1 million

c.  10 million

d.  1 billion

One.  This is all one cell.  What you’re looking at is a frond from a genus of seaweed called Caulerpa.  Caulerpa grows in tropical waters and is considered an invasive species in the Mediterranean Ocean.  Each individual of Caulerpa is one huge, enormous cell.  The inside of the plant is a syncytium, which means that millions of cell nuclei are floating around with no cell membranes to separate them.