Answer:
The manipulated variable is plant A listening to classical music.
The responding variable is plant B just there growing lol, its the control group.
Explanation:
The given angles sum to less than 90°, so the remaining angle must be more than 90°. (The total of all angles is 180°.) Triangle ABC has an angle greater than 90°, so is obtuse. Since the triangles are similar, their corresponding angles are congruent. Hence ...
.. D. Triangle XYZ is obtuse.