What is the difference between permafrost and the active layer?

Can a trait be both polygenic and have multiple alleles? explain why or why not.

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.

Which of the following can be assumed about the layers in areas 2 and 4