Consider the movement of water through the water-vascular system in starfish. Rearrange the following statements in order with 1 representing the first step. The following photo might be of help.   1: 1 2: 2 3: 3 4: 4Matching

Question Image
A

From the ring canal, radial canals run outward through each arm. Lateral canals connect these radial canals to ampulla that lie at the base of tube feet.

B

When the ampulla contracts, the fluid is prevented from entering the radial canals by a one-way valve and is forced into the tube foot, thus extending it.

C

Water enters the system through the madreporite.

D

Water then flows through the stone canal to the central ring canal.

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