nitrite

"All he had to show for four years of attendance at college was a framed piece of paper."

"The butcher at the local market sells fresh, high-quality beef. "

"The contamination of the water supply caused many people to get sick. "

"a blood sample"

"The radical proposed a new school policy to improve student access to resources. "

"A possible solution to the math problem is to use the formula. "

"After the heavy rain, the runoff flowed from the fields into the nearby river, carrying soil and fertilizer with it. "

"The dentist gave the patient nitrous to help them relax during the tooth extraction. "

"The sweet smell of many fruits, like bananas and apples, is due to the presence of esters. "

"The guard blew his whistle to indicate imminent departure."

"The gardener used fertilizer to help the flowers in the garden grow bigger and stronger. "

"During the cell division process of meiosis, if a pair of chromosomes fails to match up properly, the single, unpaired chromosome is called a univalent. "