In humans, bone marrow creates multiple types of blood cells in a process where A) differentiated cells divide to produce undifferentiated cells
B) undifferentiated cells divide to produce
differentiated cells
C) specialized cells divide to produce other types of specialized cells
D) one cell is magically transformed into another cell

Acommon kind of mechanical weathering is called

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates