Answer:
Sentence 2
Explanation:
Sentence 2 displays an explicit claim, the main idea of the text and gives readers a preview and a gist of what they are about to read. These are elements of a topic sentence.
Answer:
Used to be considered the unknown value
Main Idea: The main idea is that tigers are going extinct but now acts are being done to help this from happening.
SD1: "A study released that the world's wild tiger population has risen for the first time in century"
I can't figure out the other 2 details.
Sorry.