Answer:
When a meteoroid enters the Earth's upper atmosphere, it heats up due to friction from the air. The heat causes gases around the meteoroid to glow brightly.
Explanation:
Answer: In cells, chemical energy is gradually released in a series of chemical reactions that are assisted by enzymes. ATP--when cells break down food molecules, some of the energy on the molecules is released as heat. Cells use much of the remaining energy to make ATP.
website: Explanation: http://www.wctech.org/www.wctech.org › wcts › Staff › chapter 9 photosynthesis & cellular res..
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The answer is heart desease
Answer:
B. It is done by humans to select certain traits useful to us.
Explanation:
There are two main types of selection: natural and artificial. Natural selection is all of the other answers, it is seen over generations and allows the fittest to survive. It also occurs with no human intervention. However, artificial selection is done by humans. It occurs when humans breed animals to best fit their needs. This is best seen in dog breeding.