The actions of internal organs are regulated by the part of the brain called the

What are some aquatic organisms that live in cold water temperatures?

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

We all have different forms of genes from our parent(s).what are these different forms called? a.alleles b.characters c.dna d.resources