An important factor that brought changes to the hunter-gatherer way of life was that?
a. there wasn’t enough rain for the crops they planted to grow.
b. illness reduced their numbers.
c. men began to outnumber women and the number of gatherers declined.
d. large prey animals were becoming extinct.

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explanation:

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.