Gene flow is the movement of genes into and out of a gene pool.
Answer:
Gastritis or also celiac disease
Explanation:
Resistance to a Disease matches up with Immune System
Fetus Develops is apart of the Reproductive System
The Woman's Skin is apart of the Integumentary System
For the Flinching, it's the nervous system
Also for the Baseball player, it's the nervous system.
I hope this helps, and I also hope you get a 100% on this assignment.