any specific behavior | the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose |
the trait of being active; moving or acting rapidly and energetically | a person or thing that is a resource that helps make something easier or possible to do |
an organic process that takes place in the body | a means of serving |
a process existing in or produced by nature (rather than by the intent of human beings) | a person who contributes to the fulfillment of a need or furtherance of an effort or purpose |
the state of being active | |
(chemistry) the capacity of a substance to take part in a chemical reaction | |