Unicellular or multicellular

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

How many types of rock can form from the rock cycle

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.