Prokaryotes that thrive in oxygen free environment are called

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays