"That which holds" the universe together, the underlying principle of social, moral, and cosmic duty (or social order) is known as

Dharma.

Explanation:

According to Vedic texts and literature, there is a giant cosmic order that holds" the universe together, the underlying principle of social, moral, and cosmic duty (or social order). This order is known as Dharma.

It is universal law that maintains the balance of the cosmic order with that of individual's moral and social behaviours. It helps in bringing harmony and balance between a human life and the universe.

the enslaved people onboard suffered from illness with some frequency

the use of email to replace slower surface mail.