Word play
Military
World
Biology
Food
100

Difficult or challenging

not soft

Hard

100

this is the call sign of any United States marine corps aircraft carrying the president of the United States 

Marine one

100

what place is known as the largest micro-continent

Madagascar

100

What is the hardest substance in the human body

Tooth enamel

100

Who made thanksgiving an official holiday

Abraham lincoln

200

To run away quickly, much like usain

often paired with a nut

Bolt

200

The signing of the Paris peace accords officially ended direct US involvement in this war 

Vietnam war

200

What is the only country that borders the united kingdom

Ireland

200

Benthos is the collective name of plants and animals that live on the bottom of what

A lake

200

Which president was the first to pardon a turkey

John f Kennedy 

300

To adhere, affix, or cling to

a part of a branch from a tree

stick
300

In 1952, the USAF created project blue book to study this

UFOs

300

Mt Fuji is the highest point located in this Asian country

Japan

300

A concentration of CO2 in the blood stimulates the breathing center in which part of the body (be specific)

Medulla oblongata

300

What nationality was the person who invented a hotdog

German

400

An assignment or station

an upright support, stake

Post

400

Fort Benning is a US army post located in this state

Georgia

400

What is the name of the deepest point in earths oceans

Mariana Trench 

400

Where in the body is blood produced

Bones

400

What country do tacos come from

Mexico

500

Tenth place out of ten

to endure

Last

500

In the US military, what does the acronym NCO stand for

Non-commissioned officer

500

What country ends with the letter Q

Iraq

500

What is the largest living structure on earth

The great barrier reef

500

Which state is sometimes referred to as the popcorn state of the USA

Indiana