What is the correct way to say the plural of platypus?

No, "school of fishes" is not the correct way to refer to a group of the same type of fish. The correct way to say that is "school of fish" since the plural of fish is fish.

The plural of business is businesses.

The plural of activity is activities.

The plural of bucket is buckets.

The plural of pony is ponies.

As a title, it doesn't matter. In grammar, if you are talking about bringing music, you could say "music is on the way". In plural: same. You could also say "Your music is on the way" or "Her music is on the way".

That is the correct spelling of the plural noun "mushrooms."

The correct plural of the word "status" is "status." Although spelled the same way, the plural form is pronounced in such a way so that it rhymes with "loose."

Multiple Choices is not correct, because both words in the phrase are plural. By the word's nature, multiple is already plural meaning more than one. By adding the letter s onto the word choice, you are then making that word additionally plural. The correct way to say that something has multiple options would be to say Multiple Choice.

although looking like a plural word, 'news' is an uncountable singular noun. so the correct way to use it is: "this is good news!"

The plural of ostrich is ostriches.

The noun ticket form the plural by adding an "s" to the end of the word: tickets.

It is just the same as deer and fish. The correct way for the plural for is trash ( the same as the singular form).

there is only one Gemini so..

There "are" no "exudates" (plural).

It is grammatically correct to say: There is nothing wrong with this machine. It is not grammatically correct to say: Will it is be grammatically correct to say .... The correct way to write that or say that would be: Would it be grammatically correct to say....

Do it the PLATYPUS way and be awesome

No. The correct way to say that you disagree with something would be "in disagreement."

No, I'm sorry it is not. The correct way to say it would be, "for your convenience."

The correct way to say that phrase is "He must have."

No. The correct way to say it would be, "when midnight was rung in."

The correct way to write it is ' 120 '. The correct way to say it is "One hundred twenty".

He, you and I is not grammatically correct. The proper way to say this is you, him and I.

That is the correct (capitalized) spelling of the plural noun "Martians."

Halos is the correct way to spell the plural form.