The best way to do a observation can be a microscope or by taking notes ,and by , taking pictures or, asking questions about the subject that you and the teacher or you, your teacher and the class is talking about .! Hope this helps ..
Answer:
The concentric vascular bundles is amphivasal
How does weight effect the distance a paper airplane will fly?
It is carbon dioxide. Photosynthesis use carbon dioxide to produce oxygen.
By low temperature, it can melt. High pressure will raise the melting point of the rock.
