Question

There are probably fewer than 3,000 manatees (Trichechus manatus) left in the world. Which would probably cause the extinction of the species?

Answer 1

Spread of a disease that reduced fertility rates in manatees. 

Answer 2

Answer: Option H; Spread of the disease that reduced the fertility rates in manatees.

Explanation: Due to the disease, the population of manatees, which got affected died. This lead to decrease in fertility rate, which had a major impact on the population of the manatees. Option G is incorrect, because increase in range would actually increase the population.