PPP 3 As a coral scientist, you have recently been sent a core sample from the Great Barrier Reef in

Australia. Comparing the oldest portion of the coral sample with the newest, you discover that

the oldest pieces of coral contain only 60% of the "C contained in the modern sample. Using that

information, estimate how old this portion of the reef is and discuss your reasoning.

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.