A dragon that is heterozygous for black horns is mated with a dragon with white horns. What are the genotypic ratio and the phenotypic ratio of the offspring?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

Witch theory suggests all living things are made up of cell or cells