The short answer is that leaves fall off trees when they aren't doing their job any more. A leaf's job is to turn sunlight into food for the tree. ((But to be honest with you you don’t really need to answer this question, it’s a hypothesis. You can get this wrong it’s a part of the experiment))
A codon chart is used to describe amino acids by their genetic RNA code. A codon chart should be given to you when you are doing your lesson or assessment. Hope this helps!
