Ingenhousz was the scientist that demonstrated that the green parts of plants absorb carbon do and release oxygen only in sunlight.
Answer:
2. The altitude of Polaris changes in a definite pattern as an observer's latitude changes.
Explanation:
Since Polaris is located over the Earth’s tilt of axis it appears to follow the observer's latitude. If you were to follow Polaris from the North Pole(0°) to the Equator (90°), it will make a half circle. This will prove that the earth has a spherical shape.