Which of the following statements about chromosomes is correct?

The statement that is correct is "The number present in a specie is constant." Chromosomes are structures made of DNA molecules that carry genetic information in living organisms. Each species has a specific number of chromosomes, which is constant and unique to that species. For example, humans have 23 pairs of chromosomes, while dogs have 39 pairs of chromosomes. Chromosomes come in different shapes and sizes, and their appearance can differ between species, so the statement that "All the chromosomes of a species are the same shape" is incorrect. Chromosomes are not neatly arranged in the cytoplasm, but instead, they are found in the nucleus of a cell. The nucleus is surrounded by a nuclear membrane that separates the chromosomes from the cytoplasm. Finally, chromosomes do not bear ribosomes on their outer membranes. Ribosomes are tiny structures in the cytoplasm that are responsible for synthesizing proteins. They are not located on the outer membranes of chromosomes.