Match each type of secondary source with its use

gives a concise of information on specific matters → reference books

provides a person's viewpoint on a specific issue → opinion pieces

provides detailed information about a person's life and achievements → biography

often used to teach about a particular subject → textbook

Explanation:

hope this helps :)

food chain i would say only because there is competition on getting food and survival

the answer is "focused on"

lol gave an answer 1 week that's the answer for those who need it in the future xd