1.Past simple tense: "In ancient times, people demonstrated remarkable adaptation and innovation" uses the past simple tense to describe actions completed in the past, providing a clear historical context.
2.Relative clause: "using the sun and stars" is a relative clause that provides additional information about how timekeeping systems were developed, adding complexity to the sentence.
3.Prepositional phrase: "By innovating with the materials available to them" uses a prepositional phrase to explain the means by which people created tools and structures, enhancing the sentence's detail and depth.
4.Adverbial phrase: "without the reliance on electricity" functions as an adverbial phrase, explaining the condition under which people lived, adding nuance to the sentence.