Question

How would life on earth be different if its axis were not tilted with respect to its orbit? a. there would be no seasons.

Answer 1

The seasons would be much shorter.
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Answer 2

If the Earth was not tilted at all, we would have no seasons at all! If it were tilted differently, the seasons would be of a different length. We would, however, still have day and night as the Earth would keep on rotating, which is what gives us the day and night cycle.