Final answer:
The passage uses compare-and-contrast to show plastic's flexibility and low cost versus its environmental drawbacks and aluminum's superior strength and recyclability.
Step-by-step explanation:
The compare-and-contrast organizational pattern of the passage effectively supports the author's purpose by highlighting the advantages and disadvantages of using plastic and aluminum as manufacturing materials. The author compares the two materials on various aspects such as strength, durability, electrical conductivity, and recyclability. Examples provided demonstrate that while plastic is inexpensive and versatile, it lacks strength and is challenging to recycle, contributing to environmental issues. On the other hand, aluminum, despite being more expensive, offers higher tensile strength, better durability, is an excellent electricity conductor, and is much easier to recycle, making it a more sustainable option.