How can a scientist ensure that his Studies involving humans or animals are conducted under strict policies and procedures. This solution addresses which limitation? or her data are reliable?

What do historians call the political, social, or cultural circumstances surrounding an event?

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;

"if i have seen farther than others," said newton, "it is because i have stood on the shoulders of giants." who were the giants to whom newton was referring? could this be said of any scientific accomplishment? explain.