Answer:
the beginning of the Cenozoic
Explanation:
- The Cenozoic period began with the 65 million years ago and continuous till today and is composed of the modern-day inhabitants and is also known as the age of mammals and these were as the hornless rhinos and flight less dinosaurs.
Answer:
Hi again! Here are my notes on Italy from my geography class last year:
<em>Geography of Italy</em>
Italy is a boot-shaped country to the south of the nations of France, Austria, Slovenia, and Switzerland. Sharing a Mediterranean culture with the Greeks, the Romans built on and borrowed from the Greek advances in civilization. Rome was the capital of what would become a far-reaching empire that would spread these ideas around the known world 1500-2000 years ago. Ideas like trial by jury, judges, plaintiffs, and defendants in court systems came from Rome. Engineering of architecture, roads, aqueducts, Roman baths, and the formation of the Catholic religion all came from the Roman culture. Art, music, literature, and the sciences were all made more sound by the Renaissance, which started in Rome and influenced the world. Along with Greece, Italy is part of the European Union, and its economy is based on textiles and industrial products.
Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
