Question How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.(1 point) Responses The percentage of dark energy has shrunk in scientists' estimates. The percentage of dark energy has shrunk in scientists' estimates. The percentage of ordinary matter has grown in scientists' estimates. The percentage of ordinary matter has grown in scientists' estimates. The percentage of unknown material has grown in scientists' estimates since the 1970s. The percentage of unknown material has grown in scientists' estimates since the 1970s. The percentage of dark matter has shrunk in scientists' estimates since the 1980s.
The percentage of dark energy has shrunk in scientists' estimates.
The percentage of ordinary matter has grown in scientists' estimates.
The two correct answers are:
1. The percentage of ordinary matter has grown in scientists' estimates over time.
2. The percentage of unknown material or dark energy has grown in scientists' estimates since the 1970s.
The correct answers to the question "How has scientific understanding about the composition of the universe changed over time?" are:
1. The percentage of ordinary matter has grown in scientists' estimates.
2. The percentage of dark energy has shrunk in scientists' estimates.
To arrive at these answers, one can analyze the given responses:
- Regarding the percentage of dark energy, both options state that it has shrunk in scientists' estimates. However, these options are repeated twice, indicating a duplication error. Therefore, we can disregard them.
- Similarly, regarding the percentage of unknown materials, there is also a duplication error. We can disregard these options as well.
- The remaining option states that the percentage of dark matter has shrunk in scientists' estimates since the 1980s. However, this contradicts current scientific understanding. Dark matter is still considered a significant component of the universe and has not significantly decreased in scientists' estimates. Thus, this option is incorrect.
- This leaves us with the option that the percentage of ordinary matter has grown in scientists' estimates. This aligns with scientific progress, as scientists have refined their understanding of ordinary matter over time, leading to an increase in its estimated percentage.
In summary, the correct answers are:
1. The percentage of ordinary matter has grown in scientists' estimates.
2. The percentage of dark energy has shrunk in scientists' estimates.