For a human zygote to become a fetus it must undergo
A) fertilization
B) Cell division by mitosis
C) Cell division by meiosis
D) Recombination
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Ответ:
B
Explanation:
After fertilization, a zygote undergoes rapid cell division (mitosis) to develop into a foetus
Ответ:
The function of the EGR valve is to recirculate small amounts of exhaust back into the combustion chambers of the engine in order to decrease the combustion temperature, thereby reducing the formation of smog-producing nitrogen oxides. EGR valves can malfunction by becoming stuck open or closed due to carbon buildup.