In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. this is an example of a reaction. the opposite process is a reaction.
options for both of the blanks are
a) combustion
b) decomposition
c) replacement
or d) synthesis

Decomposition and Synthesis

Explanation:

The reaction of decomposition and synthesis are two of the important reaction. The decomposition reaction is usually defined as the reaction by which a bigger compound (molecule) is broken into smaller molecules. For example:

2KNO₃ > K₂O + N₂O + O₂

On the other hand,  the synthesis reaction is defined as the reaction that accumulates smaller molecules and transforms into a larger compound (molecule). For example:

K₂O + N₂O + O₂ > 2KNO₃

Thus, the correct answers are options (B) and (D), i.e. Decomposition and Synthesis.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

to this one it would be receptive field