Final answer:
The conditions on the ship, such as poor ventilation and lack of sanitation, contributed to the spread of diseases among slaves during the transatlantic slave trade.
Step-by-step explanation:
The conditions on the ship, such as poor ventilation, lack of sanitation, and close quarters, were connected to the diseases that were so common among slaves. In the close quarters of the ship, infectious diseases like dysentery, smallpox, and conjunctivitis could easily spread among the enslaved people. The lack of proper food, water, and hygiene also weakened their immune systems and made them more susceptible to diseases.