This question is unanswerable, because there are millions of species on the earth, and still many we haven't yet discovered. Even still, your best bet is a few million.
No,it is not a cell.It is an organell.
cytoskeleton
The insects, of which about one million species are known. This is about half of the total number of species known.
cell membranes and plasma membranes
declines
The "carrying capacity" for a species is the total number of individuals that can get enough food to survive and reproduce.
The "carrying capacity" for a species is the total number of individuals that can get enough food to survive and reproduce.
There are currently about 1.4 million identified animal species, and about 1 million of them are insects. Biologists estimate the number of animal species could be as many as 5 million.The total of living plant and animal species is estimated as 8.7 million species. This does not include bacteria which could number in the hundreds of millions of species and subspecies.
biosphere
species richness is the total number of species present if there are 4 species present and 5 of each then the species richness is 4 as there is 4 types of species while the species evenness is 5 a species eveness is the relative abundance of each species.
Number of different species
I think you mean molefraction; this is equal to the number of moles of a species A divided by the total number of moles of all species (including A) in a mixture. Thus the sum of all the mole fractions in a mixture is equal to 1.