Natural acids because chemicals erode rocks in chemical weathering
Answer:
ameoba
Explanation:
ameobas are single celled organisims
1. Arteries : Carry's blood away from the heart.
2. Veins : Carry's blood back to the heart.
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3. Capillaries : exchange of materials and gases between the cell and vessel takes place here.</span>
Answer:
A polar molecule is a molecule that has a positive and negative charge at either end.