You can draw a free body diagram with two 250N forces acting on the human, one from each side. The net force is 0 because the two applied forces cancel each other out since they are in opposite directions.
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When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming. Already the average global temperature has increased by 1C.
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The red tides are caused because of the algal blooms, which discolor the ocean's water. These tides are red because of the presence of the pigments known as phycobilin. The blue phycocynin and red phycoerythrin contributes to the red color of these tides. The chlorophyll a contained in most of these algae are seen only when the algal blooms although at other times they are still present but deep in the ocean where they cannot be seen.
The green tides will be produced when the green algae, chlorophyta, blooms. These algae obtain energy from the sun for photosynthesis.
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