Answer:
Respiration (breathing) is the way your body gets oxygen into the lungs from the air outside. Cellular respiration describes how your cells make ATP - a molecule used to provide energy for chemical reactions.
Explanation:
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<span>blastocyst
The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.</span>
Answer:
Earth's continents were once connected in a single supercontinent.
Explanation:
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The atomic number of protactinium is 91