Question

5.
Elements are always combine in a fixed ratio of their
a) volume
b) Atomic weight c) pressure
d) Density​

Answer 1

Explanation:

Since the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster due to the low concentration of oxygen in the environment than that seen in terrestrial organisms

Answer 2

Answer:

volume is the answer probably