Fill in the blank the structure of a muscle, several fascicles lie bundled together to form a muscle, just as several lie together to form compact bone tissue. Each muscle fiber, which is a muscle cell, consists of protein fibers. Similarly, the matrix that lies outside bone cells consists of a protein fiber called .

1. bone cells 2. ligaments 3. osteons

1. actin 2. collagen 3. myosin

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.