Symptoms such as diarrhea and flatulence(gas). what is the cause of lactose intolerance?

What two fields of study provide the core information that is used to classify organisms?

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

I’m stuck on this question cuz i’m stupid sksksksk