**50 points** is this right help pls

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

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

What blood vessels carry blood to the heart? away from the heart?