The inner planets are made of rocks while the outer planets are composed of gas.
The inner planets are closer to Sun and are small in size while the outer planets are far away from sun and are larger in size
Answer: Characteristics: The fins are supported by rays, as the name indicates. In contrast to the cartilaginous fish they have a rigid skeleton. The swim bladder is also a unique feature of most ray-finned fish, enabling them to maintain buoyancy as they move up or down in the water.
Answer:
D) Sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.
Explanation:
Lysosomes break down nutrients and old cell parts
