What is the main idea of the first paragraph? It took humans a long time to develop the match.
O
Learning how to make fire was a long struggle for humans.
The world went for years without adequate fire.
O
We often forget how the match changed the world.

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Type the correct answer in the box. spell all words correctly. certain species of insects introduced accidentally in a forest are destroying all the douglas fir trees in that forest. the wood of these trees is extensively used for construction. in order to control the damage caused by these insects, the forestry department decided to introduce the moth caterpillar in the forest. these caterpillars are natural predators of the insects. which method did the forestry department implement to control the invasive species? the forestry department implemented a(n) control method.