(Q).
Q: What layered form of carbon is used as a lubricant and in pencils? Choices: - carbonite - copper - lead - graphite A:
(A).
graphite

(Q).
Q: Why do birds need a light-weight body? Choices: - for cooling - water flotation - food shortages - to stay aloft A:
(A).
to stay aloft

(Q).
Q: What does the human protein cytokine help fight? Choices: - mutations - parasites - toxins - infections A:
(A).
infections