Where in the cell are chromosomes located?

Chromosomes  are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made up of protein and a single molecule of deoxyribonucleic acid (DNA).

The unique structure of chromosomes  keeps DNA tightly wrapped around spool- like proteins, called histones. Without this kind of packaging, DNA molecules would be too long to fit inside the cells. 

 DNA molecules in a single human cell  if unwound from their histones  and placed end to end, they would measure 6 feet in length.

Chromosomes  play a  key part in ensuring that DNA is accurately copied and distributed to new daughter cells as the parent cell divides to form new cells.

the answer is d. embryo