1
under the ground
2
an occasion when someone buys or sells something, or when money is exchanged or the activity of buying or selling something
3
a hard outer layer that covers, supports, and protects the body of an invertebrate animal such as an insect or crustacean
4
the act of buying something hoping that its value will increase and then selling at this higher price in order to make a profit
5
a problem that is difficult to deal with
6
to change, especially continuously and between one level or thing and another
7
to produce a new living thing of the same type as itself
8
the length of time for which a person, animal, or thing exists
9
to (cause an egg to) break in order to allow a young animal to come out
10
to give something to someone for a short period of time, expecting it to be given back
11
involving the possibility of something bad happening
12
money that is earned in trade or business after paying the costs of producing and selling goods and services
