Which is the number of chromosomes in a haploid cell?
a. 1n
b. 2n
c. 3n
d. 4n

Option A.

Explanation:

Haploid cell is the cell that have a single set of chromosomes . In human, haploid cells have 23 chromosomes compare to 46 number of chromosomes diploid cells have.

The haploid cells have 1n of chromosomes and they are found in sex cells or gametes i.e eggs and sperms.

The haploid cells are normally produced during meiosis.

the correct answer is d

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.