Final answer:
Manatees are considered an endangered species due to habitat changes caused by construction along Florida's rivers. They are herbivores that feed on vegetation, and habitat destruction is a major threat to their survival. Preserving their habitat is a solution that could help their population grow.
Step-by-step explanation:
1) The manatee is considered an endangered species because their environment is changing in a negative way due to the construction of hotels and homes along Florida's rivers. This has led to noise, activity, and boat traffic that scare manatees and can cause serious injuries. Additionally, the destruction of water plants that manatees rely on for food is also a contributing factor.
2) Manatees are herbivores because they feed on a wide variety of submerged or floating vegetation such as algae.
3) One environmental condition that might lead to the disappearance of manatees from Florida's rivers is habitat destruction. The construction of buildings and the destruction of water plants are examples of habitat destruction that can negatively impact manatees.
4) One solution that could help the population of manatees grow is the preservation of their habitat. This would involve limiting construction along Florida's rivers and protecting the water plants that manatees rely on.