Which of these is a strategy to combat lack of natural resources? Raising meat animals
Settling in one area
Using irrigation
Planting in the spring

They used irrigation to combat the lack of natural resources :)

iragation

Explanation:

because food isnt a natura recourse and planting only in the spring wont help and settling in one area wont do anything either, so its irragation becasue water is a natural recource and thats an effective way to help.

he was able to speed up production of the processing of seeds

the answer would be a).