Answer:
The urinary system and Integumentary system
Explanation:
The urinary system is the primary waste elimination system in the body. However, the Integumentary system also eliminates some waste products.
The genes appeared in a later generation, they were dormant.
The foetus is not protected from many diseaseslike poliomyelitis,typhoid,tetanus,measles etc.
First you must create a hypothesis, figure how you can conduct your experiment, doing controlled and uncontrolled. Report your experiements then return the hypothesis and figure out if it was correct.