Lakes occupy less than two percent of the Earth’s surface, yet they help sustain life For instance, lakes gives us fish to eat, irrigate crops, and generate electrical power. What does the word sustain probably mean?
support
obstruct
prolong
destroy

It's to know your purpose before you read something because a purpose can:

The tankers are so large how did some crew members get from one point to another while on board

Write a literary analysis essay about an intercalary chapter of the grapes of wrath. your essay should examine how the structure and language support the overall purpose, and it should include specific examples from the text to support your claim. your essay should include the following elements: • a claim that takes a clear stand on the author's purpose, supported by main points • evidence from the text that supports your claim and main points • commentary that the reader understand how your evidence should be interpreted • an introduction, body and conclusion that organize the content of your essay