Which of the following is the correct explanation of a derived character A. the presence of a backbone is a derived character of mammals because all mammals have a backbone
B. the presence of four limbs is a derived character of snakes because the ancestors of modern snakes had limbs even though modern snakes do not
C. the presence of hair is a derived character of mammals because all mammals have it
D. retractable claws are a derived character of carnivors because some of the animals that are carnivores have retractable claws

Iwould say silver and gold

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If you get a map and put the countries a states all together it forms all one piece you can also tell because of the earth quakes

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.