Use blue litmus paper. This is an indicator that can safely determine whether it is a base or an acid by changing color in response to the substance. This color indicates whether it is an acid or a base. Refer to the pH scale to see if the substance is basic or acidic.
Answer:
It declined drastically
Explanation:
The moths were active at night and rested by day on white birch trees, where they were effectively camouflaged from predators.
However, as the city became more industrialized, the trees were covered with black soot from the factories.
The white moths lost their camouflage, so their population declined drastically, as their predators could now find them more easily.
Answer:
no system should be improved
Explanation:
Explanation:
Atomic number of chromium is 24 and electronic configuration of 
is as follows.
: 
Atomic number of copper is 29 and electronic configuration of 
is as follows.
: 
Atomic number of cobalt is 27 and electronic configuration of 
is as follows.
: 
Answer:
a plus sign: +
Explanation:
a plus sign is used to separate one reactant or product from another
