Q: The hardest natural substance, diamond is a form of what element? Choices: - zirconium - zenon - hydrogen - carbon A:
carbon

(Question)
Q: What planet is closest to our sun? Choices: - Earth - Venus - Pluto - mercury A:
(Answer)
mercury

Ques: Q: What element enters the body when an organism breathes? Choices: - helium - water - methane - oxygen A:
Ans: oxygen

(Q).
Q: Because alkali metals are so reactive, they are found in nature only in ________ with other elements? Choices: - isolation - cooperation - competition - combination A:
(A).
combination

Ques:Q: What do the letters in our blood types represent? Choices: - genomes - proteins - iron levels - alleles A:

Ans:alleles

Question: Q: What is an organic compound made up of small molecules called amino acids called? Choices: - a carbohydrate - a fat - a compound - a protein A:
Answer:
a protein