Final answer:
If Earth did not have an inclined axis, there would be less extreme seasons, equal sunlight at the North and South Poles, equal day and night lengths year-round, and the equator would not receive the most direct sunlight.
Step-by-step explanation:
If Earth did not have an inclined axis, the seasons would be less extreme. The variation in day length and direct sunlight would be very small over the course of a year, and the Sun's daily path in the sky would not vary much. Without the tilt, there would be no significant difference in the amount of sunlight received at the North and South Poles, so they would receive equal sunlight throughout the year. Day and night lengths would be the same year-round, as every point on Earth would be in shadow for half the time and in sunlight for the other half. The equator would not receive the most direct sunlight, as the Tropics of Cancer and Capricorn would be the latitudes receiving the most direct sunlight without the tilt.