Question

Which of these scientific and technological advances occurred mainly in the twenty-first century? Select the two correct answers.(1 point)
Responses

the internet
the internet

smartphones
smartphones

Mars Rover
Mars Rover

social media
social media

automobiles

Answer 1

The two scientific and technological advances that occurred mainly in the twenty-first century are:

1. **Smartphones**
2. **Social Media**

While the internet existed prior to the twenty-first century, it became widely accessible and evolved significantly during this period, but smartphones and social media emerged and gained prominence mainly in the 2000s. Mars Rovers were also developed earlier, though new models have been sent in the twenty-first century, but they are more of a continuation of earlier space exploration efforts rather than a breakthrough of the century. Automobiles were invented well before the twenty-first century.