In order for a hypothesis to be testable, scientists need to be able to carry out investigations that will either support or disprove it true or false

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

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.