That viral photo of a "drop of seawater magnified 25 times" was dramatically misleading
"This is NOT a 'drop' of seawater. The ocean is not a thick zooplankton soup, except for in some rare and special circumstances. This is the result of towing a zooplankton net around to concentrate seawater enough to actually look at the zooplankton. Basically, this photo is a swimming-pool amount of ocean concentrated down into about a half-pint of goo."