How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.(1 point)

Question

Responses

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 matter has shrunk in scientists' estimates since the 1980s.

The percentage of ordinary matter has grown in scientists' estimates.
The percentage of ordinary matter has grown in scientists' estimates.

The percentage of dark energy has shrunk in scientists' estimates.

Answer 1

The two correct answers regarding how scientific understanding about the composition of the universe has changed over time are:

1. The percentage of unknown material has grown in scientists' estimates since the 1970s.
2. The percentage of dark energy has shrunk in scientists' estimates.

While the first statement is correct, please note that the second statement is actually not a recognized trend in scientific understanding. The correct pair of responses should actually focus on how the scientific community has increasingly recognized the roles of dark matter and dark energy rather than a specific decrease in dark energy estimates.

Thus, a more fitting option could be:

1. The percentage of unknown material has grown in scientists' estimates since the 1970s.
2. The percentage of dark matter estimates has remained significant, while the understanding of dark energy has evolved, particularly around its accelerating effects on the universe's expansion.

It's important to clarify specific contexts or trends in more detail if required!