From Trilobites to Whales: Getting Bigger

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Those trilobites were huge: in the Cambrian. These days, foot-long critters are common, and not particularly big.

Scientists thought related species of animals generally got bigger as they evolved: now a team has evidence to back up that assumption. We still don't know why critters usually get bigger, though.

That, and seven "croc" species sharing the same turf in the Amazon Basin — before the Amazon was there — is what I picked for this week's post....

More at A Catholic Citizen in America.

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