Which single mammal species on Earth makes up the largest biomass?
Cows, over 650 million tonnes
15
What are the only plants that live in the ocean?
Seagrasses
15
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?
echidna
15
What is the largest toothed predator in the world?
sperm whale
15
Is the horseshoe crab more closely related to crabs, spiders, or trilobites?
spiders
15
A bit over 2 billion years ago, cyanobacteria nearly wiped out all other life on Earth. How did they do it?
by producing oxygen
15
Kangaroos and polar bears share what unusual trait?
They're almost exclusively left-handed
15
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?
Elephants and/or manatees
15
Which bird lays the smallest egg proportional to its body size?
