Who contributed to the current bodoy of scientific knowlegde

What are the base pairing rules? how does this allow for dna replication

When the grand canyon formed many small mammal population were divided. some members of the population were on one side and others are on the other, therefore, they were no able to mate with one another. over time this separation and inability to mate with one another led to the emergence of new species. this type of speciation is called a) sympatric speciation. b) allopatric speciation. c) parapetric speciation. d) peripatric speciation.

Elaboreaza in spatiul rezervat un plan ce ar include cel putin 4 norme de profilaxie a analizatorului cutanat la om