The steps of the dna ladder are made of

When species lose their habitats they may..

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

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