These are segments of the columnar stem of what fossil echinoderm animal? Each disk is a single crystal of calcium carbonate, and in life the animal's living tissue threaded through the hole passing through the stack of disks.

According to a recent survey, the local government wants to classify people according to their income earning capacity. they want to do so in order to provide special facilities for the poor. who among the four individuals will be classified as poor? a. joseph earns $2.25 per day b. maria earns $1.50 per day c. rosita earns $2.00 per day d. tim earns $ 1.00 per day