What are the benefits of online note-taking tools? They teach students note-taking skills.
They give students the answers for tests.
They provide a fast and easy way to take notes.
They tell students what to take note of.

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.