Question

1. why is limestone considered an organic sedimentary rock?

it is formed from rock fragments that are compacted and cemented together.
it is formed from minerals that came from organisms that were once living.
it is formed from lava hitting hot water and cooling.
it is formed from water evaporating and leaving minerals behind.

Explanation:

Organic sedimentary rocks form from remains or byproducts of once-living organisms. Limestone often contains calcium carbonate from marine organisms like coral, shellfish, and algae, which matches this definition. The other options describe clastic (A), igneous (C), and chemical sedimentary (D) rocks respectively.

Answer:

B. It is formed from minerals that came from organisms that were once living.