Answer:
They safely store carbon in the soil and vegetation in this time of global warming. Therefore, they are now protected. Many people would chop down these trees; putting them at risk of dying out.
Explanation:
Answer:
In representative democracy, citizens elect representatives, who in turn represents their interests in the elected government. The vast majority of democracies in the world are representative.
In a direct democracy, citizens have more direct ways to participe in the government, and in the making of the laws of the country or region. There are very few places in the world where direct democracy is the norm, Switzerland being perhpas the most noteworthy example.
Answer : scientists determine the absolute age of a rock in millions of years before present rather than just the age of the rock relative to the rock units around it. This information helps geologists develop more precise geological history models for the rocks and regions they study.
Explanation:
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.
