Answer: No
Explanation:
The american alligator are sighted in rivers and lakes and they are not native species as they do not live in New York City.
They are usually the pets that escaped from the owner and reached the lakes and river anyhow. They cannot sustain their life based on the number of individual that come to the lakes and rivers.
They do not affect the other species nearby them and because of these reasons they cannot be considered as ecological community.
Answer:
At the time of birth, much of the skeleton in this area is formed by a cartilaginous, soft, flexible and short-bone material. Evolutionarily this characteristic is adaptive because it allows folding inside the uterus and easy to leave at the time of delivery.
Mass extinction refers to the procedure in which a huge number of species gets extinct suddenly.
The following are the correct matches of the events taken place in the mentioned time period:
1. Cretaceous-Tertiary: The mass extinction of dinosaurs took place.
2. End-Triassic: Possibly resulting due to massive rifting of the surface of the Earth.
3. Permian-Triassic: It is considered the worst mass extinction in the history of the Earth.
4. Late Devonian: It is possibly a result of the growth of forest on the land surface of the Earth.
5. Ordovician-Silurian: The earliest mass extinction took place at this time.
