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2. Discuss why a four chambered heart is more efficient than a two chambered heart in delivering oxygenated blood to the various body parts. What evolutionary changes in the lifestyles of organisms selected for the evolution of the four chambered heart?

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As organisms became more active, a four-chambered heart was selected for because of its ability to separate oxygenated and deoxygenated blood.

Why is a four-chambered more efficient in oxygen delivery than a two-chambered heart?

A four-chambered heart is a heart consisting of four chambers, namely;

  • upper ventricle
  • lower ventricle
  • upper atrium and
  • lower atrium

A four-chambered heart is more efficient in oxygen delivery than a two-chambered heart because it does not allow for mixing of oxygenated and deoxygenated blood.

A more active lifestyle by organisms and larger body size selected for a four-chambered heart in organisms.

Therefore, the efficiency of a four-chambered heart is in it's ability to separate oxygenated and deoxygenated blood.

Learn more about four-chambered heart at: https://brainly.com/question/978296

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