On average, this human organ covers between 14 & 18 square feet
Skin
July temperatures on this continent range from about -94 to a balmy high of around -40
Antarctica
Martha Stewart's favorite recipe for this sandwich includes light mayo & uses 10 whites & only 2 yolk
an egg salad sandwich
The Jamaican fruit type of this emits high-frequency calls to orient itself in the dark
Bat
These identifying ridges on the hands are visible on human fetuses at about 4 months
Finger Prints
This continent covers only about 5% of the earth's land area; deserts cover about 1/3 of the continent
Australia
Kraft informs us that Americans eat 2.2 billion of these cooked sandwiches a year
Grilled Cheese
The field type of this leaping insect chirps by rubbing a scraper on one forewing along a row of teeth on the other forewin
Cricket
The average life span of these receptor cell groups in the mouth is 8-10 days
Taste bud
This continent has the longest freshwater lake, 420 miles, in the world
Africa
A sandwich specialty of Montreal is this pastrami-like delight, viande fumee en francais
The adult male of this Asian great ape makes a "long call" heard for more than a mile & lasting up to 5 minutes
an orangutan
In the average human body there is enough of this element, atomic no. 6, to make about 900 pencils
Carbon
Both the highest & lowest places on earth are on this continent
Asia
This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water
Periscope
This species of swan, cygnus buccinator, is named for its low-pitched call
the trumpeter swan
This lowermost portion of the brainstem is responsible for regulating both heart rate & respiration
Medulla Oblongata
A waterfall on this continent has the longest drop in the world, 3,212 feet
South America
U1, this country's first naval submarine, entered service in 1906
Germany
This animal call is the loudest in the world at 180 decibels and can be heard 800 kilometers away
The Blue Whale