Cones, cylinders and spheres can have vertical cross-sections that are circles.
Explanation:
Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion. ... This supported the idea of oxygen as a key trigger for the evolutionary explosion.
The dreariness of the speaker's life away from Innisfree
-Gradpoint confirmed
Tectonic plates moving toward or away from the each other.
