Your answer would be the second one B
Answer:
Explanation:
The mass of the substance is determined by subtracting the first reading from the second. A container holding the substance of interest is placed on the balance and weighed. This is the first reading. The substance to be used is removed from the container and the container weighed again.
The first one is going to be b and the second one is going to be a
The opposite of an echosystem is Chaos pollution and exosytem
I'll give you the first one: it's a reactant of respiration. if you want the other answers just dm me so its easier to communicate
