Down;s syndrome is also known as trisomy 21 because it is caused by an additional copy of chromosome 21. The correct answer is the third one: 21st.
Mostly fossils such as Animals with hard shells and bones. get fossilized
Answer:
molten rock in the earth's crust. 1. The blazing magma was surging by us. 2. With the temprature cool, magma would be hardened into rock.
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i believe hope this helped
