Quirks and Quarks19:53Our planet’s circulatory system depends on animals eating, excreting and expiring From the tiniest insects to the largest whales, biologist Joe Roman says animals play an ...

How animals act as the circulatory system of our planet — by eating, pooping, and dying. Amanda Buckiewicz | CBC Radio | Posted: March 15, 2024 6:58 PM | Last Updated: March 15, 2024.