The body temperature of the mammal will be higher than that of the reptile. this is because the mammal body temperature does not depend on its environmental temperature while a reptile does not have a stable body temperature and depend on the temperature of its environment.
Well, if it didn't dissolve then at the bottom. If it does then everywhere, but mostly at the bottom.
Plants use energy from sunlight to turn water and carbon dioxide into an energy-rich sugar called glucose which is then called photosynthesis and then photosynthesis takes place inside capsules in the leaf cells, called chloroplast.