Giai đoạn cần đánh giá tác dụng thuốc trên người (thử nghiệm lâm sàng): A. phase I

B. phase II

C. phase III

D. phase IV

Are the earth's ocean floor and continents the same age geologically? why or why not?

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

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?