Answer:
I think the answer is b. DNA
Within Earth's mantle they circulate heat and drive plate tectonic processes. This is where two lithospheric plates meet and crash or crunch together. This process is responsible for mountain building, earthquakes, and volcanoes.
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Answer:
A common birth defect that is usually due to an extra chromosome 21( trisomy 21) .
The zygote must contain genetic information from the mother and from the father, so the gametes must contain half of the chromosomes found in normal body cells.
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