The number of animals with tough shells and exoskeletons exploded around 540 million years ago in the early Cambrian, probably in response to a rise in predation at the time. (newscientist.com)
The outer tough shell of the hull is first removed and the interior of the grain is used. (thenakedlabel.com)
Common sense says you have to remove the spiky, tough shell from the pineapple. (smartdogowners.com)