Multiple Choice
Which of the following is the best description of the cane toad's introduction to Australia?
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1. Introduction to Biology
Natural Selection and Evolution
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Which of the following best explains the main cause of the seasons on Earth?
A
The gravitational pull of the Moon
B
The varying distance between Earth and the Sun during the year
C
Changes in Earth's rotational speed
D
The tilt of Earth's axis relative to its orbit around the Sun
Verified step by step guidance1
Understand that Earth's seasons are caused by the tilt of its axis, which is approximately 23.5 degrees relative to its orbital plane around the Sun.
Recognize that this axial tilt causes different parts of Earth to receive varying amounts of sunlight throughout the year as Earth orbits the Sun.
During summer in a hemisphere, that hemisphere is tilted toward the Sun, resulting in longer days and more direct sunlight, which increases temperatures.
During winter in a hemisphere, that hemisphere is tilted away from the Sun, leading to shorter days and less direct sunlight, which decreases temperatures.
Eliminate other options: The gravitational pull of the Moon affects tides, not seasons; Earth's distance from the Sun changes slightly but does not cause seasons; and Earth's rotational speed does not vary significantly to impact seasons.
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