Proportionally, bacteria comprise less than 1% of all described species. ... Most importantly, the researchers estimated that each insect species is likely to host at least 10 bacterial species found nowhere else.
Apples contain quite a bit of air inside them which causes the overall density of the apple to be less than that of water, so it floats. By testing the individual parts, we can see that not all parts of the apple float in water but when all the parts are put together they do.
Crocodiles have no such thing as old age. Although they can't die of natural aging, they also can't live forever. Nature has a way of killing them. The way they die is out of starvation or if they contract a disease.