Answer:
change in a population through genetic variation over time
Explanation:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer huge quantities of carbon into the atmosphere. Extra carbon dioxide is lowering the ocean's pH.
I do not think it's more common in a certain group. It's one of the most common genetic birth defects. It's estimated that 1 in 700 babies are born with down syndrome (this is about 6,000). There are over 400,000 people in the US with Down syndrome.
The source of energy for Earth is our sun. Sir Issac Newton thought of
light as a steady stream of particles. His contemporary, Christian
Huygens, thought that light had a wave motion. They were both correct.
Light energy consists of moving quanta of photons. In 1802 the English
physicist Thomas Young confirmed hypothesis by proving that light
traveled in waves.
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Photosynthesis is the major process by which wavelengths are converted
from light energy into a form of chemical energy which can be used by
living organisms. This conversion process will be studied later in the
semester. The energy from the sun is stored in the bonds that hold
molecules together.
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One major storage source of this energy is the glucose which can be
produced as a by-product of photosynthesis. When glucose is broken apart
in the process of cellular respiration, it can be made available for
use by organisms in all metabolic activities. The level would be about
5,000.
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This is much better than having it in the comments. Hope this helps you. :)
