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P1 the feature of mature lobsters
A mature lobster has two claws: the crusher( short stout) and the cutter(long slender)
the same present probability of cutter or crusher
P2 the growth course of claws
4-5:symmetrical/cutter like—> 6:begins to appear->7:appear
the discovery of EV
at 4-5 stage: if one claw is removed, the other one becomes a crusher.
at Adulthood: removal does not change anything.
P3 the explanatory hypo of EV’s discovery
differential use(frequency) determines the crusher or cutter.
P4 Test the explanatory hypo in P3
condition 1 with oyster chips, 50% crusher, and 50% cutter.
condition 2 without oyster chips, two cutter claws-> the following variable does not change this symmetry
bilateral asymmetry双边不对称
substrate:n. 培养基,基质,基层;底物,酶作用物;(供放置或刻的)底面 |
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