Arooster laid an egg on top of the barn roof. which way did it roll?

Specialized cells which perform a particular function form : organisms organs tissues

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

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?