problem 1: What is the major reason for differences between plant and animal cells?

problem 2: What organelle supplies plants with energy and what method does it use?

problem 3: What organelle supplies animal cells with energy and how does it do this?

problem 4: Transport in plant and animal cells is completed in the similar fashion. Why would this have been kept the same (evolutionarily speaking) when so many other things have been modified?

problem 5: The nutritional requirements of plants and animals are much different. Which would have survived best in a primordial earth which had very little oxygen or organic material available?