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In most cases it is, but this can vary between instructors. This is a question you should ask your professor.
Alternatively, you can use i.e. or e.g. And leave out the ect. altogether. I.e. is used to make a clarification and e.g. is used to state examples. Either of these you can use to state a list without using ect. You could also use clauses such as 'in essence' or 'in other words' (instead of i.e.) and 'for example' (instead of e,g.). Any if these alternates do not require the use of ect. because you are making explicit statements about something. Just be sure you use i.e. and e.g. correctly. Saying, "I like games if chance, i,e., poker and craps," means you like to play poker and craps. Saying, "I like games if chance, e.g., poker and craps," means you like to play various games of chance, poker and craps being a couple of examples.
yes, depending on instructor and essay
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