What type of proteins makes up connective tissue?

Collagen, fibres etc.

The fibrous proteins which are found in connective tissues of the animals are either collagen, elastic, or reticular fibers.

This collagen fibers provide strengths to the connective tissues. It prevents the connective tissues from torn or separation of the connective tissues from the surrounding tissues.

So, it helps strength and joining with other tissues.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

condensation. good luck!