The plow is the invention that increased crop yields and made soil more porous.
The main argument of a text is the primary idea that is discussed in the text. This idea is supported by evidence that lends credence to it.
<h3>How to find the main argument in a text</h3>
The main argument in a text refers to the primary idea that is stated in the text. This idea is backed by pieces of evidence or facts that support the primary idea.
To identify the main argument, study the text to determine the opinion of the author. Also, note how he supports these with pieces of evidence.
The excerpt in question was not provided but the above explanations can help in arriving at the correct answers.
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Europeans were originally motivated to explore the seas to discover previously unknown lands, especially after the contact with America, where europeans found all kind of valuable goods. The portuguese were the first to pursue maritime exploration, soon to be followed by the spaniards.