Mixture. Mixtures can be both heterogeneous and homogeneous. Heterogeneous mixtures are mixtures that don't have a fixed composition, meaning that if you take smaller samples from two different parts of a larger sample, the ratios of the substances will differ.
Geocentric-Ptolemy, Aristotle
Heliocentric- Copernicus, Galileo, heliocentric
Because the gravity levels decrese and so does the oxygen levels
I think it would be 1, 4, 5! Also I love your profile picture!
