a lock is a system that allows ships to travel upstream and down stream
No, they have veins, aka vascular bundles (xylem and phloem/tubes that transport water and sugar around the plant).
how do you replace rear door lock assembly on 92 pONTIAC tRANSPORT
No one knows for sure
Secondary active transport aka facilitated diffusion [depending on your teacher].
A valve spring "keeper" or AKA a valve spring "retainer" is used to lock a valve spring to the valve.
A lock. A lock raises and lowers a boat to the level of water in the next lock.
Water Transport
water transport
must plant be alive to transport water
A lock raises and lowers the boat to the level of the water in the next lock.
A boat has to wait in a lock for the water to be the right level in a lock.
The Romans would transport water in aqueducts.