What are the only plants that live in the ocean?

Which single mammal species on Earth makes up the largest biomass?

What is the largest toothed predator in the world?

Which bird lays the largest egg?

The Hyrax is a 2-5kg African and middle eastern mammal, very similar to a marmot or a weasel. What species are they most closely related to?

Kangaroos and polar bears share what unusual trait?

Which bird lays the smallest egg proportional to its body size?

Is the horseshoe crab more closely related to crabs, spiders, or trilobites?

What Australian animal has backwards facing feet, no teeth, a four-lobed penis or two vaginal openings, and the second lowest body temperature of any mammal?

A bit over 2 billion years ago, cyanobacteria nearly wiped out all other life on Earth. How did they do it?