Final answer:
If Earth and Mars had no tilt in their axis with respect to the Sun, the seasons on both planets would be less pronounced.
Step-by-step explanation:
If Earth and Mars had no tilt in their axis with respect to the Sun, the seasons on both planets would be less pronounced. Seasons are a result of the inclination of a planet's axial tilt being inclined from the normal of the planet's orbital plane.
On Earth, the tilt of 23.5 degrees causes variations in the angle of direct sunlight, resulting in different climatic seasons. If there were no tilt, the variation in day length and direct sunlight would be very small, and the Sun's daily path in the sky would not vary much.