What are 3 examples of a food chain that exists in nature

How are gene and protein sequences used to classify organisms?

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2