"Well, if you have any biology needs doing, I might help. I've been basically everything that has a biology, including no small amount of things that're either weird or extinct, so I know all there is to really know." As if to prove this, he shapeshifted into a form with which he was becoming disturbingly comfortable.
His head ("her" head was an inappropriate term, no matter the gender of the body he inhabited at any given time) was hanging off the edge of the bed as he spoke in what was very nearly Rose's voice. "I'm also really good with chemistry, but you'd know that, wouldn't you?" There was little chance of him ever being mistaken for Rose, even putting aside the skin color. Rose was aloof most of the time, with a slightly icy tone to her voice that waxed and waned. On the other hand, Gar said everything as if it were the punchline to the funniest joke in the world. It was probably a bit disconcerting to hear her voice with his inflections.