C is the correct answer buddy.
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Answer: anaphase
Explanation: Nondisjunction can occur during anaphase of mitosis, meiosis I, or meiosis II. During anaphase, sister chromatids (or homologous chromosomes for meiosis I), will separate and move to opposite poles of the cell, pulled by microtubules
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Answer:
Resting heart rate would be between 60-80 bpm
Heart rate after 15 jumping jacks will be around 110-130 bpm
Heart rate after 30 jumping jacks it will be around 150 or less bpm
The avarage will vary depending on your specific beats per minute
But this also does not include how fast or slow you did the 15 and 30 jumping jacks