Living in the dark According to the author, what is the main obstacle to exploring the ocean depths? Explain why, citing evidence from the text..

The correct answer to this open question is the following.

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The main obstacle to exploring the ocean depths is the excessive pressure the sea exerts on humans and all the equipment needed to explore the depth of the oceans and the corrosive effect of the water.

The pressure is too dangerous for humans because it has a direct effect on the lungs of humans.

Another costly reason is the power to turn the equipment needed to explore the depth of the sea. Power resources are too expensive and their duration, so limited.

its hard for me to see which word is supposed to be in bold. if i knew then i would be able to better.

an argumentative essay presents objectively a topic and its main characteristics. besides, it states all this information and facts by giving authentic and substantiated proof to the audience. by contrast, a persuasive text purpose is to convince the audience about some facts by presenting them according to his/her emotions and feelings. the main purpose of a persuasive text is to convince the audience to agree with the author´s opinion. on the other hand, in the argumentative essay, the author leads the writer to recognize his/her point of view as the correct one.