Based on the diagram, which statement explains how energy is conserved during this chemical reaction?
А
B
Potential energy
of a system
C
Reaction progress
A. The potential energy changes indicated by C and B involve energy
lost by the surroundings.
B. The potential energy lost by the reaction system (C) is also lost by
the surroundings.
C. The potential energy lost by the reaction system (B) is gained by
the surroundings.

that's what i got you can count the number of atoms

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

hope this :