From what i remember back in like 7th grade slaves were treated like items on a ship, they had little to no space and were crammed up together, i remember being shown a picture drawing of them even being put in the storage area. There, they would not be able to move much nor leave. all their wastes were not cleaned resulting in sickness being spread. Many were also hungry. At the end of the journey, lots of slaves died due to the reasons stated above.
Answer:
Starting in the 1900s, technologies and industrial developments advanced enormously, modifying the living conditions of human beings in general, throughout the entire width and length of the earth's surface.
Thus, starting with the Industrial Revolution of the mid-1800s, technologies such as the steam engine and the development of automated means of production generated a series of technological advances that allowed a greater modification of the environmental environment of human beings, in in order to guarantee better living conditions.
Now, these modifications, which at first were not harmful or at least not to a great extent, over the years and the development of technological advances began to impact the environment: the extraction of raw materials began To generate scarcity of them, the emission of gases into the atmosphere began to generate the phenomenon of global warming, and even indiscriminate hunting led to the extinction of hundreds of thousands of animal species.
Density is mass per volume 
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Hope this helps.
