Based on the cladogram shown in the image, which group has a common
trait that all the other groups share?

I put Mammals, The victim was not stubbed.

Explanation: im not really sure about but the final answer for the presentation/assignment is "Professor Astro used a cougar attack in the kitchen"

Compound microscope  

Explanation:

Compound microscope is the kind of optical microscope which creates a two dimensional image when the visible light is illuminated it magnifies the object and produces its image. It uses two kinds of lenses which are objective lens and the ocular lens.