examiB. Examine the fossil productids and find the bases of these spines. Which valve has the most $($and largest$)$

spines?

$($BRACHIAL VALVE$)($PEDICLE VALVE$)$

C$.$ Based on your observation, which side do you think faced upward when the animal was alive?

$($BRACHIAL VALVE$)$

$($PEDICLE VALVE$)$