"The flight was postponed by bad weather for which I had a ticket". The sentence should read, "The flight for which I had a ticket was postponed by bad weather."
The preposition in the given sentence "Gracie and Helen had not seen each other for 50 years" is 'for'.
<h3>What is a preposition?</h3>
A preposition is a word or phrase that appears before a noun, pronoun, or noun phrase to indicate direction, time, place, location, spatial relationships, or to introduce an object.
Prepositions include words like "in," "at," "on," "of," "to", etc.
Thus, the preposition in the given sentence "Gracie and Helen had not seen each other for 50 years" is 'for'.
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Answer:
it establishes the idea that home remedies are rooted in traditional knowledge
it reinforces the idea in the fourth paragraph by emphasizing the healing properties of plants
Explanation:
The two ways the third paragraph continues to the development of ideas in the passage is by establishing the idea that home remedies are rooted in traditional medicine.
Another way is by reinforcing the idea in the fourth paragraph of the healing properties of plants.