Molecule, organelle, cell, tissue, organ, organ system, organism, community, population, ecosystem, biosphere
Answer:
You are saying which one but what is which one???
Explanation:
Answer:
B. Cartilaginous fish
Explanation:
Sharks have a cartilaginous skeleton. Cartilage is less dense than bone which allows sharks to move quickly through the water without using too much energy.
I believe the correct response would be D. Are not composed of one or more cells.