Question

1. part a: which statement best identifies one of the central ideas of the text?

a. the earths natural elements and distance from the sun allow humans and animals to live successfully on earth.
b. scientists observations of earth show that the planet may be habitable for humans in the future.
c. the earths placement in the universe guarantees that humans will always be able to live comfortably there.
d. scientists understanding of earths makeup and movements is still limited, but it is becoming more advanced through satellites.

Explanation:

The Earth's natural elements like water, atmosphere and its distance from the sun create a habitable environment for life forms. Option B is incorrect as it implies future habitability when the focus is on current conditions. Option C is wrong because the Earth's placement doesn't guarantee eternal comfort for humans. Option D is about scientific understanding rather than the central idea of Earth's habitability.

Answer:

A. The Earth's natural elements and distance from the sun allow humans and animals to live successfully on Earth.