This is a cell or organism having half of the diploid chromosome number, symbolized by "n".

The correct answer is Haploid cell or haploid organism.

Explanation:

Haploid cells are the cell that has only one copy of each chromosome instead of two copies as in diploid cells (2n). These are having half chromosome number than diploid cells that why they are symbolized by "n".

These cells are commonly gametes or sex cells that fuse to form diploid condition in most of the organisms. These cells are the result of meiosis cell division.

Thus, the correct answer is haploid cell or organism.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.