Adouble-walled sac called the encases the heart, which serves to protect the heart and anchor it inside the chest. vena cava pericardium aorta septum

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

Name the organs of humanelemintary canal.

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.