A carbon budget is the amount of carbon we can release into the atmosphere before global temperatures rise above two degrees Cel
sius. Our current rate of carbon
released from burning fossil fuels is 37 billion tonnes per year. If we continue to burn fossil fuels at this same rate, how many years could it take to reach the limit of the
carbon budget shown in the graph?
8 years
7.4 years
6.8 years
10 years
released from burning fossil fuels is 37 billion tonnes per year. If we continue to burn fossil fuels at this same rate, how many years could it take to reach the limit of the
carbon budget shown in the graph?
8 years
7.4 years
6.8 years
10 years
1 answer:
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Answer: The blanks can be correctly filled up with prophase I and metaphase II.
Explanation:
In females, finite number of oocytes are present since birth. The process of oogenesis initiate in embryonic stage only. However, oogonia divide and mature to form primary oocytes. These primary oocytes start meiotic division but arrest in prophase I stage before birth.
After a girl attains puberty, one primary oocyte resumes its division each month during a menstrual cycle. The primary oocyte divides to form secondary oocyte and polar body.
Polar bodies degenerate after completing meiosis II. However, secondary oocyte halts its division again at metaphase II until fertilization takes place. Once fertilization takes place it completes its meiosis II and results into mature ovum and polar body.
