What is the speculum on waterfowl?
1.Differences in bill coloration
2.Bright-colored patch on the secondaries of diving ducks
3.Bright-colored patch on the secondaries of dabbling ducks
4.Range of colors waterfowl can exhibit

Witch theory suggests all living things are made up of cell or cells

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods

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.