Astudy of the relationship between exercise and heart attacks that is conducted among men who do not smoke. is gender a confounder in this study?

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.

Twind is considered to be an abiotic factor because it.?

Which is an example of a decomposer? a. bear b. algae c. grass d. bacteria d bacteria