What does a ganglion contains?

a seed contains nutrients a spore dosen't.

Obviously you're supposed to put contains when "something contains something else" such as "That jar contains food." then contain in a present tense sentence like "Can you contain your dog, please?"

A Collection of nerve cell bodies located outside the Central Nervous System.

contain means ingredient

8thManage PM is one good project management information system, it contains all the functions above.