A secondary source is anything written after the fact
<span>it probably break apart with cleavage, because the carbon atoms in graphite from sheets that could split apart easily in layers.</span>
The theory is most likely A) Valid. If a group of authorized scientists agreed on the theory, it would be valid. It would most likely be unreliable if it was only one scientist working alone and biased. If you don't have a group of scientists, the theory most likely won't be true because it hasn't been tested many times.
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➳ CloutAnswers
False. The leg consists of the femur, patella, tibia and fibula. Which is the entire leg.
SUBSTANCE: Material composed of only one kind of matter throughout (same atoms or same molecules) ELEMENT: A substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means. Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen.
