In 2010 a new type of life form was found in california's lake mono. the microbe found has a variation in the structure of its dna. dna usually consists of nitrogen bases, sugars and phosphates. however, this newly-discovered microbe uses arsenic if phosphorus is not available. this fact might lead to the discovery of a) new dna sequences in mammals. b) new dna structures in mammals. c) possible life in non earthlike environments. d) phosphorus being unnecessary for dna structures in mammals.