Which of the following characteristics are typical of brachiopods?
A. Lophophore between the shells
B. Two calcified valves: dorsal and ventral
C. Two lateral calcified shells
D. Zoecium attached to rocks or other substrates Colonial

B) Two calcified valves: dorsal and ventral.

Explanation:

Brachiopod is a group of lophotrochozan animals that have shells both on the upper and lower surfaces. Brachiopods range from 0.039 to 3.937 inches long. The largest brachiopod happened in the upper part of the lower Carboniferous. In the lower Carboniferous, there consists two calcified valves; the dorsal valve and the ventral valve. Valves are referred to as shells. These valved protect the ventral and dorsal surfaces of the animal.

Option B

Two calcified valves: dorsal and ventral

Explanation:

Brachiopods are animals that have hard shells on the upper and lower surfaces, unlike the left and right arrangement in molluscs.

The dorsal and ventral arrangement of shells in brachiopods is their key distinguishing feature from the bivalve molluscs and other animals.

This makes option B the correct answer

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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