13. Whales, birds, snakes, and fish need oxygen in order to survive. Even though they share this trait, these animals are not related because
they do NOT -

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.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above