Select the correct answer from each drop-down menu. The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. This blood enters the and then moves down. The presence of the prevents the backflow of blood inside the heart
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Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?
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Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel
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Select the correct answer from each drop-down menu. The heart is a muscular organ that pumps blood....
Mathematics, 10.12.2020 17:20
Mathematics, 10.12.2020 17:20