A
B
C
D
100
a special activity or purpose of something

function

100

to put your hand or another part of your body lightly onto something

touch

100

related to one thing in particular

specific

100

to make something, usually a liquid, flow in a particular direction by using something that works like a pump

pump (v)

200

the ability to see

sight

200

connected with breathing

respiratory

200

an act of holding something in position and preventing it from falling

support

200

the quality of being strong

strength

300

a liquid chemical that can react with and dissolve other materials

acid

300

an order given to someone

command

300

not complicated; easy to understand

simple

300

easily broken

fragile

400

the act of protecting something

protection

400

fully developed

adult

400

several different

various

400

difficult to understand; made of many parts that are connected

complex

500

a collection of cells that form the different parts of humans, animals, or plants

tissue

500

one of the long parts that connect the feet to the rest of the body

leg

500

more than two but not too many

several

500

a part of the body that has a particular purpose

organ