Which statement descibes natural selection?

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 do science, technology, and disease have to do with each other?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?