I have to answer about 25 questions about one scientific text on English. I already chose one, but need I can't add URL here, and need help :(

Answer 1

What is the name and author of this text?

Answer 2

TITLE: Pet ownership, dog types and attachment to pets
in 9–10 year old children in Liverpool, UK

Answer 3

http://www.readcube.com/articles/10.1186/1746-6148-9-102?locale=en

Answer 4

That's it.
I can't decide is this text more formal or informal and what is the aimed readership?
I have to find 2 examples of definition, 2 of description, and 1 of generalization. 5 collocations. 2 markers of explanation.