Answer:
Humans add carbon dioxide to the atmosphere when they burn fuel in factories and other biomass sources. Humans take in carbon from the food they eat from the soil and return it back to the soil through waste products and decomposition.
Explanation:
When humans add carbon into the atmosphere the main contributors are burning of substances like fuels and biomass and from eating.
The energy the electron gives up passing between the electrodes is equal to the product between its charge and the potential difference between the electrodes:

where
e is the electron charge

is the potential difference
Plugging numbers into the equation, we find that the electron gives up is
Answer:
a. Magnesium dichloride
b. Magnesium phosphate
c. Calcium hydrogen carbonate