What is segmented digestive system, appendages

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

What type of graph presents information about how often certain or traits occur?

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.