Read the passage. Oxygen is one of the most essential elements found on Earth. Humans and all living things depend on oxygen for survival. This vital element is obtained different ways. The primary source for oxygen is from the ocean, which gives more than fifty percent of Earth's oxygen and most come from tiny ocean surface plants called phytoplankton. In the process of photosynthesis, phytoplankton releases oxygen into the water. Photosynthesis is also the process used on land by plants, grass, and trees to convert the sun's energy and nutrients to be released as oxygen. Other forms of oxygen are in the Earth's crust and minerals, and do not contribute to the oxygen we breathe in the atmosphere. What does the author imply in the passage? A. Oxygen cannot be produced without plants and trees. B. Oxygen found in the Earth's crust is important to plant life. C. There would be enough oxygen in the air without phytoplankton. D. The only source of oxygen in the atmosphere is from photosynthesis.

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

Read the sentences below and complete the instruction that follows. the coach, who has ten years' experience, has agreed to lead our team. the coach who has ten years' experience has agreed to lead our team. select the answer that explains the difference between the two sentences, as well as the purpose each clause serves for the benefit of the reader. a.) the first sentence contains a noun clause that functions as a predicate nominative; therefore, it renames the subject of the sentence for the reader. the second sentence contains an essential adjective clause that modifies the noun "coach"; therefore, it clarifies for the reader which coach is being discussed. b.) the first sentence contains a nonessential adjective clause that modifies the noun "coach"; therefore, it provides the reader with interesting details about the subject of the sentence. the second sentence contains an essential adjective clause that modifies the noun "coach"; therefore, it clarifies for the reader which coach is being discussed. c.) the first sentence contains a nonessential adjective clause that modifies the noun "coach"; therefore, it provides the reader with interesting details about the subject of the sentence. the second sentence contains a noun clause that functions as a predicate nominative; therefore, it renames the subject of the sentence for the reader. d.) the first sentence contains an adverb clause that modifies the verb "agreed"; therefore, it provides the reader with the answer to the question "when." the second sentence contains an essential adjective clause that modifies the noun "coach"; therefore, it clarifies for the reader which coach is being discussed.

Read the passage. and thus they fought all the long day, and never stinted till the noble knights were laid to the cold earth. and ever they fought still till it was near night, and by then was there a hundred thousand laid dead upon the down. in the passage from morte d’arthur by sir thomas malory, what are the bolded words an example of?