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.
d.

Explanation:

The Earth's natural elements like water, atmosphere and its distance from the sun create a habitable environment for life. Option B is incorrect as the text likely focuses on present - day habitability rather than future. Option C is too extreme as Earth's placement doesn't guarantee always - comfortable living due to natural disasters etc. Option D seems off - topic if the text is mainly about Earth's habitability for life.

Answer:

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