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(call)milkweed to lay their eggs. But monarch butterflies have been facing growing problems these years.As more and more wild land has been turned into large farms,monarch butterflies have had trouble 39 (find) enough milkweed.Many farms also use chemicals 40 will kill insects in order to protect their plants.These chemicals also affect monarch butterflies.Besides,pollution has made milk- weed less 41 (health)for monarch butterflies than it used to be. 42 (scientist)say monarch butterflies will be in danger of dying out in the next 20 years if nothing 43 (do)to save them.Things that people can do to help include planting milk- weed,controlling the use of chemicals,protecting wild areas, and planting trees.