Locks are needed when the waterway flows down/up hill. Instead of going over a waterfall, you 'lower' the vessel using a series of locks.
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Why are some people say that Article BIO is no longer needed
it is based on population in the statePOPULATION! :) if your doing the crossword, GOODLUCK!:DD
island hopping
Some filaments of the Spirogyra are branched and look like bushes. Some of the others do not have any branches.
Voting requirements are specific to each organization. You would have to consult the by-laws for what is allowed in that club or group. Some allow 'proxy' voting, others do not. Some permit absentee ballots, others do not.