What is a hypothesis? a question
an observation
an explanation
all of the above are correct

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Wich level of organization includes all the other levels or organizations

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey