Final answer:
Smartphones and drought-resistant seeds are examples of technologies improving upon existing technology by revolutionizing communication and enhancing crop yields, respectively.
Step-by-step explanation:
Two examples of technologies that have been developed to improve upon existing technology include the smartphone and drought-resistant seeds.
The invention of the smartphone revolutionized personal communication, combining the functionality of a phone, computer, and media player into one handheld device.
On the other hand, the development of drought-resistant seeds in food production has significantly enhanced crop resilience and yield, particularly in drought-prone regions, contributing to food security.