Which best describes how shared characteristics can be used to identify evolutionary relationships? If organisms have a common ancestor, most of their characteristics will be shared. If two organisms have a shared characteristic, it means one evolved from the other. If organisms have many shared characteristics, they are likely to be closely related. If organisms have a shared characteristic, it means they are closely related.\

Nucleus is the organelle that contains chromosomes

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Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.