Which of the following statements about chromosomes is correct?

The correct statement about chromosomes is that the chromosome number present in a species is constant. Chromosomes are thread-like structures found in the nucleus of a cell and carry genetic information in the form of DNA. Each species has a specific number of chromosomes, and this number is constant within the species. For example, humans have 46 chromosomes, dogs have 78 chromosomes, and cats have 38 chromosomes. Chromosomes vary in size, shape, and arrangement, and they are not neatly arranged in the cytoplasm. The outer membrane of the nucleus bears nuclear pores, which allow molecules such as RNA to move in and out of the nucleus, but not ribosomes. The ability to bear ribosomes is a characteristic of the rough endoplasmic reticulum, which is an organelle involved in protein synthesis.