Question

These fossils are important, and scientists are interested in them *because plants can be identified by their flowers*.
a. independent clause
b. adjective clause
c. noun clause
d. adverb clause

Answer 1

This is not an independent clause: it can't stand on its own.

It's also not an adjective clause: it does not provide information bout some noun.

Rather, it tells why something is the case: this is an adverb clause.