Answer:
The lowest level, which is usually the producers.
Explanation:
This is because on every level of the trophic system, some energy is lost before the next level. So the level with the least lost energy is the lowest
If it has valves then it is a vein.
Answer:
A. oxygen
Explanation:
element in magma is most abundant is oxygen.
C: Liver. It's secreted by the liver and stored in the gall bladder
