A quasar is formed when a super massive black hole has enough material around it to fall in it's accretion disk.
It was used by Hubble to measure velocities of galaxies
Answer:
A, 6 water molecules splitting apart
Explanation:
I believe the energy from the sunlight is used to split the water. Then we are left with its electrons, hydrogen, and oxygen. Also, photosynthesis only uses 6H2O molecules, so A seems most logical.
Mass extinction refers to the procedure in which a huge number of species gets extinct suddenly.
The following are the correct matches of the events taken place in the mentioned time period:
1. Cretaceous-Tertiary: The mass extinction of dinosaurs took place.
2. End-Triassic: Possibly resulting due to massive rifting of the surface of the Earth.
3. Permian-Triassic: It is considered the worst mass extinction in the history of the Earth.
4. Late Devonian: It is possibly a result of the growth of forest on the land surface of the Earth.
5. Ordovician-Silurian: The earliest mass extinction took place at this time.
