What effect on the evolution of mammals was caused when the continents drifted

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

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite