Answer:
When a meteoroid enters the Earth's upper atmosphere, it heats up due to friction from the air. The heat causes gases around the meteoroid to glow brightly.
Explanation:
Serve as messengers, controlling and coordinating activities throughout the body.
To accomplish this, the reaction sequence includes both reactions irreversible and reversible.
Irreversible reactions are the ones that include conversion of reactants to products where the products cannot convert back to the reactants. On the other hand in reversible reactions, the reactants and products are never fully consumed (constantly are reacting and being produced).
d. an opening specified for waste removal is present
C. Direction
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