Which question MOST likely may have led to the development of stem cell therapy? A. Can undifferentiated cells be used to repair parts of the body?

B. Can human genes be introduced into the cells of people with genetic disorders using a virus?

C. Can human genes be integrated into bacterial DNA so bacteria can copy the genes and produce insulin?

D. Can DNA be cut into fragments by restriction enzymes and then separate into unique patterns?

*PLEASE PLEASE IM TAKING MIDTERM I AM CURRENTLY FAILING THE CLASS*

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.