Which of the following statements about the human reproductive system is correct? MCQ with Answer and Explanation

Explanation:
The urinary bladder is a muscular sac that temporarily stores urine received from the kidneys via the ureters, until micturition. The urethra drains urine to the exterior.

Explanation:
All chordates possess a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail at some stage of development. The notochord may be replaced by the vertebral column in vertebrates. Gills and scales are not universal (e.g., mammals lack both). The notochord provides skeletal support and is the defining feature of the phylum Chordata.

Explanation:
Bacterial cell walls contain peptidoglycan (murein), a unique polymer that maintains cell shape and protects against osmotic pressure. The reason correctly explains why peptidoglycan is essential.