In cells without cell walls, the forms the outside boundary that seperates the cell from its environment.

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

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

Is there any solid scientific evidence that humans have been cloned?