yes
Whales usually eat Plankton, which is a microscopic algae type thing. Many things eat microscopic animals, I believe herring is one species.
yes
Some examples of animals that live in lakes and ponds are fish, frogs, freshwater clams among many other animals.
yes i think that is how it goes in a ecological pyramid.
Microscopic animals are animals (mostly bugs) than cannot be seen with the naked eye and the aid of a Telescope (hence the name microscopic) is needed to be able to see them.
Other, even smaller animals.
animals in oceans, ponds, and lakes
Microscopic animals
A phylum of microscopic animals.
Louis Pasteur discovered that microscopic animals could live in food
Animals and plants that live in ponds.
basically reptiles :)