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White raven [17]
3 years ago
13

Which scientist first said that planets travel in fixed paths or orbits

Biology
2 answers:
pantera1 [17]3 years ago
8 0
The first scientist that said that planets travel in fixed paths or orbits is Kepler. A
Ulleksa [173]3 years ago
8 0

Answer:

Ptolemy

Explanation:

Just did the quiz lol

Hope i helped! xx

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c

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Endosymbiotic theory explains the origins of eukaryotic cell organelles such as mitochondria in animals and fungi and chloroplasts in plants.

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How is a secondary immune response different from a primary immune response?
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The secondary immune response is the immune response when the same antigen , memory cells that was encountered before is remembered and the immune system make antibodies to counter it.

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There is a difference between the primary immune response and secondary immune response.

In the primary immune response occur when the immune system encountered an antigen for the first time which lead to the generation of memory cells and and the B cells with the T cells produce antibodies.

While the secondary immune response occur when the same antigen that was encountered the first time is encountered the second time and it lead to the stimulation of memory cells to produce more and high quantities of antibodies to fight foreign substances.

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