Plz help me! One word for an environment and the organisms living there is biome, so we call the bacteria living in and on the human body "the human .”

A) microecosystem

B) microbiome

C) ecosystem

D) community

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Why has two different alleles for the same trait?

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.