Dolphins emit high frequency sounds which bounce off objects in their environment. these reflected sounds them to locate food, predators, and other dolphins. where have human beings used technology in a similar manner?

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

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.

First dropdown options: a. runoff b. condensation c. evaporation second dropdown options: a. photosynthesis b. transpiration c. sweating third dropdown options: a. raindrops b. clouds c. animals