What possible problems might be encountered by using only shells to
classify mollusks?

answer; /// i believe the name your looking for is called (plaque)or check good luck

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

oxygen +1 most likely