3. B
4. A
5.A
6. A (i think)
Hope this helps
Explanation:
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Bull sharks have the unique ability of keeping salt in their bodies even freshwater
As you go down a group on the periodic table, atomic radii tend to increase because elements with larger atomic numbers have more occupied electron levels which take up more space surrounding the nucleus.
I hope this helps.
I think the answer that you are looking for is B but im not a 100% sure
