Misc: In 1849 Mrs. Elizabeth ---------- becomes first woman physician in U.S..?

Questions

The digestive juices of crocodiles contain so much ---------- that they have dissolved iron spearheads and 6-inch steel hooks that the crocodiles have swallowed.?

---------- can withstand water pressure of up to 850 pounds per square inch.?

---------- are powerful jumpers. A 20-inch adult can leap 20 feet in a single bound.?

Several poison-dart frog species are bred at the National Aquarium in Baltimore. There, researchers gauge the toxicity of poisonous species by taste. No danger is posed, because frogs caught in the wild gradually become less poisonous, and captive offspring are nontoxic. The change may be due to diet. The frog's natural menu - mostly tropical ants and springtails - cannot be duplicated in a ----------?

Javelinas are free-ranging, yet territorial animals that travel in small herds. One of the reasons they travel in numbers is so they can huddle to stay warm - they don't handle cold well and can ----------?