Until about 200 years ago people thought that sponges were aquatic plants.
a plant
Because they didn't move about about as most animals do. =)
they thought they were plants
The Greeks thought is was a chariot of the gods...
The past participle is thought.
There's no past tense for thought. (:
infinitive: think past: thought past participle: thought
There are so many things that people of the past have dreamed of but never invented any failed invention is a thought of the past that hasn't been invented yet.
The Greeks thought is was a chariot of the gods...
Amoeba sponges
No. Sponges only have a few different types of cells and are among the most divergent animal species. They are sessile and were formerly thought to be plants.