Is it multiple choice? I believe it's brain, but I could be wrong.
Asteroids vary greatly in size and are mostly made up of frozen water and gas. This one is true.
They are said to be "mostly formed of ice and gas" as they rarely can be found consisting of stone, nickel and iron. These are extremely dangerous in our Universe.
Answer:
1. Arch of Aorta
2. Thoracic Aorta
3. Abdominal Aorta
4. Common/external iliac artery
5. Femoral artery
6. Popliteal artery
7. Anterior tibial artery
8. Dorsalis pedis artery.
This is what I got for this question, hope this helps!!
Explanation:
I would go with c because its tells you right in there that the ecosystem help who lives around that area.
