agriculture is thecultivation of land and breeding of animals and plants to provide food, fiber,medicinal plantsand other products to sustain and enhance life.
Answer:
Education is an important topic in Mark Mathabane’s autobiography because when he was growing up in South Africa, the apartheid system made it very difficult for a black child to get anything close to an adequate education. The experiences Mathabane relates, however, extend far beyond attending school.
The role of African traditional culture, which Mark (previously Johannes) learned from his mother, also played a significant role. His mother could not read but had learned and transmitted the cultural information orally. From his mother, he also learned optimism about his own place in the world and the possibilities for black Africans in their country, which helped counter the negativity his father held and expressed.
Water pollution affects marine ecosystems by completely killing it off. Pollution kills fish, reefs, and other underwater life. With this pollution, animal's behaviors can change, and habitats are destroyed.
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Answer: is constant
Explanation:
In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.
Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.
This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.
Answer:
there were very good resources
Explanation:
