alleryA child says a row of coins has more once it is spread out. Which conservation is missing?
ANumber
BVolume
CWeight
DMass
Answer & Solution
Correct answer: A. Number
1. Only the length of the row changed; no coins were added or removed.
2. A child who says the longer row has more is judging by length.
3. Understanding that the count stays the same is **conservation of number**.
**Why not the others:** Volume, weight and mass are tested with liquids or clay, not with rows of counters.
_Source: Wikipedia, "Conservation (psychology)", section "Tasks" (revision 1351958246)_
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