The first life on earth is commonly beleived to have originated 3.5 bya (billion years ago), yet the rise of atmospheric oxygen didn't take place until almost a billion years after this. what does this tell us about the earliest forms of life on earth?

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

Which of these best describes wde by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm

(amoeba sisters video recap: pedigrees and need