"Musea" is acceptable, and arguably more correct. However... the current, mainstream, usage is: "museums".
Museums, so sayeth The New MrSpock (Xbox Live Gamertag).
Museums.
The plural form of the noun museum is museums.The plural possessive form is museums'.Example: All of the museums' hours are posted on the main website.
The noun passes is the plural form for the singular pass. Example: The museum passes for the students are here. The word passes is also the third person, singular, present of the verb to pass.
The plural form for the demonstrative pronoun this is these.
The singular noun is museum, the singular possessive form is museum's.The plural noun is museums, the plural possessive form is museums'.
The plural form of the word "inferno" is "infernos."
The plural form of the word "ranch" is "ranches."
There is no plural form for the word, countries. This word itself is a plural.
The plural form is data.
There is no plural word for if.
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "baby" is "babies."
The plural form of the word "pharynx" is "pharynges."