The noun 'meat' is an uncountable (mass) noun, a word for something that is indivisible into countable units.
The plural noun 'meats' is a shortened form of 'kinds of' or 'types of' meat.
Units of uncountable nouns are expressed by adjectives or a partitive noun (also called a noun counter).
The noun 'meat' takes a verb for singular unless quantified in the plural; for example:
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Meat is both. "A hunk of meat" is singular. "A pile of meat" the meat is plural.
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
Who may be singular or plural.
diagnosis is singular diagnoses is plural sis = singular ses = plural
Atrium is singular - the plural is atria.
Statistics is plural, the singular form is statistic.