Question

11 multiple choice 1 point
what reasoning does grace use to determine that astrophage is a life - form?
they are found near venus, proving they are part of the atmosphere.
the organisms move independently and use stored energy for propulsion.
they have complex dna structures similar to earth’s life forms.
they react negatively to heat and light.
12 multiple choice 1 point
what is the strongest piece of evidence supporting the claim that astrophage is consuming the sun’s energy?
the astrophage are invisible to the human eye.
the petrova line is growing at an exponential rate.
the sunspots are moving too quickly.
scientists have found similar organisms in earth’s oceans.

Explanation:

For question 11: Key traits of life include independent movement and using stored energy, which are the criteria Grace uses to classify Astrophage as a life-form. The other options do not align with the core reasoning for identifying life.
For question 12: Exponential growth of the Petrova line indicates a rapidly expanding population, which would require a large, ongoing energy source like the sun's energy, making this the strongest evidence for Astrophage consuming solar energy. The other options are irrelevant to the energy consumption claim.

Answer:

1. The organisms move independently and use stored energy for propulsion.
2. The Petrova line is growing at an exponential rate.