To guard against Alaska's cold water temperatures, seals maintain a thick layer of fat beneath their skin that keeps them warm and acts something like a wetsuit.
(seals; maintain; a thick layer of fat beneath their skin that keeps them warm and acts something like a wetsuit) (a thick layer of fat beneath their skin; keeps; them) (a thick layer of fat beneath their skin; acts; something like a wetsuit)
seals a thick layer of fat beneath their skin a thick layer of fat beneath their skin
maintain keeps acts
a thick layer of fat beneath their skin that keeps them warm and acts something like a wetsuit
them
something like a wetsuit