How did scientists discover that all living things are made of it's nowhere online or in my notes. ; -;

What is the correct trna sequence that would match the following mrna sequence.gcgaua

Is there any solid scientific evidence that humans have been cloned?

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations