What type of relationship most likely exists between the birds and the elephant? a) mutualism b) parasitism c) predation d) reproductive

A.

A bird's role in an elephants life is similar to a bird/rhino relationship. The bird typically rides on the elephants back, and eats parasites, bugs, and other bothersome things for the elephant.
This means the bird benefits by having a meal, and the elephant benefits from being protected from ticks and other parasites that might negatively impact it.

C- a hypothesis or d- an observation

Atissue is a group of connected cells that have a similar function within an organism.