What is the difference between Homologous and analogous structures

Help plz

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

What protects the lining of the stomach from acidic gastric juices?

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?