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