B. Earth and all other planets orbit the sun.
During an action potential , the depolarization is so large that the potential difference across the cell membrane briefly reverses polarity, with the inside of the cell being positively charged. This change in the charge occurs due to the influx (inflow) of sodium ions into the cell.
Answer: G
Explanation:high mutation rate;vaccine
<span>It can be when a man has HIV and he passes it to a woman. Him and Her both will have it. but when she gets pregnant the child will have HIV also hers something to back it up. ''From mother to child during pregnancy, birth, or breastfeeding. Although the risk can be high if a mother is living with HIV and not taking medicine, recommendations to test all pregnant women for HIV and start HIV treatment immediately have lowered the number of babies who are born with HIV.''</span>
