"There are four seasons in a year" should be accepted.
exactly, just tried this exact answer
There are four seasons each year
I think Duolingo needs to get better translators.
We are the translators. Us and some artificial intelligence, maybe a couple people to review what the computers come up with. Saves them a lot of money on overhead.
There are 4 seasons in every year
This is obviously not talking about Texas.
"in a year there are 4 seasons" and "There are 4 (or four) seasons in a year" are Correct sentences, Birdie !!!!
"We, are not confused about this sentence" but you are Birdie!!!