I think it is changeable
A parasite is a tiny one celled animal with a changeable body outline that causes a type of dysentery. The disease can also be caused by fleas, worms, ticks, and lice.
Grammar is very important. Grammar is very useful. If one uses proper grammar, then their messages are clear and everyone can understand what they are talking about.
Spelling & Proper Grammar, for one.
It is proper grammar to say "one must play aggressively" because "aggressively" is the adverb form of the adjective "aggressive" which modifies the verb "play."
Proper capitalization is an important part of English grammar. Many websites offer information about the rules of grammar, such as Webgrammar, GrammarBook, and Grammarly. Any decent grammar textbook should also have information about capitalization.
She studied grammar to improve her writing skills.
It doesn't have one.
The proper grammar is: "Are you going to run that past him?" In this context, "past" should be "past," not "passed," as "past" is the correct word to use in this case.
She was a changeable person because she was changed from bad to good. Another suggestion: She was a changed person because she changed from bad to good, not necessarily because she was changeable. Her personality would be described as changeable only if she swung back to a former behaviour, good or bad or whatever value one placed upon it. Changeable means inconstant or inconsistent, like the weather, and implies little self-control.
According to proper English grammar, no. "With" is a preposition. You aren't supposed to end a sentence with a preposition.
The one you used is correct.
The EU currently has 27 member nations. The term country and nation are inter changeable. Either one is proper to use.