Base your answer to the question on the passage below and on your knowledge of biology
When Charles Darwin traveled to the Galapagos Islands, he observed 14 distinct varieties of finches on the islands Darwin also observed that each finch variety
ate a different type of food and lived in a slightly different habitat from the other finches, Darwin concluded that the finches all shared a common ancestor but had
developed different beak structures.
The second sentence best describes
1
an ecosystem
2
a food web
3
a niche
4
a predator/prey relationship

Darwin concluded that the finches all shared a common ancestor but had  developed different beak structures.  The second sentence best describes as an ecosystem.

Explanation:

When Charles Darwin traveled to the Galapagos Islands, he observed 14 distinct varieties of finches on the islands Darwin also observed that each finch variety  ate a different type of food and lived in a slightly different habitat from the other finches, Darwin concluded that the finches all shared a common ancestor but had  developed different beak structures. The second sentence best describes as an ecosystem.An ecosystem is a huge group of living organism such as plants,animals, micro-organisms in a particular area.An ecosystem is a community of living organisms related with the nonliving components in the  environment, together interacting as a system. its abiotic constituents, includes minerals, climate, soil, water, sunlight, and all other nonliving elements, and its biotic constituents, consists of all its living members.

The titanic is the answer