<em>a. Primary Treatment: solid waste settles into sludge.</em>
<em>b. Secondary Treatment: aerates water by adding oxygen to aid bacteria in the</em>
<em>b. Secondary Treatment: aerates water by adding oxygen to aid bacteria in thedecomposition process.✓</em>
c. Secondary Treatment: solid waste settles into sludge.
d. Primary Treatment: aerates water by adding oxygen to aid bacteria in the
decomposition process.
The doctor will recommend antihistamines.