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Level 21

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improvise
to do things without any preparation because you are forced to do this by unexpected events
heroine
a woman admired or idealized for her courage, outstanding achievements, or noble qualities.
engage
occupy, attract or involve
trickle
a movement of things into a place in very small numbers
imperceptible
almost impossible to see or notice
mutation
a change in the genetic structure of an animal or plant that makes it different from others of the same kind
subspecies
a group of similar plants or animals that are smaller than a species
readiness
state of being fully prepared for something
intervention
the act of becoming involved in an argument, fight or other difficult situation in order to change what happens
comprehensive
thorough
seek
attempt
savana
a large flat area of grassy land
promptly
immediately
corral
a pen for livestock especially cattle or horses
viable
able to survive