Question

which is the best way to complete the text?
the la brea tar pits formed from crude oil that seeped through fissures in the earths
_________ fossilized remains of at least fifty - nine species of mammals from the
pleistocene epoch have been found in the pits.
crust. because the
crust. the
crust, the

Explanation:

The first sentence ends with "earth's crust". The second sentence starts with "fossilized...". A comma is needed to connect the two parts as the second part is a continuation of the description related to the La Brea tar pits. "crust, the" is the correct choice as it properly links the two clauses.

Answer:

crust, the