Question

1. the biggest challenge for evolutionary science is a. the origin of life b. the extinction of the dinosaurs c. the cambridge explosion d. explaining the lack of life on mars e. none of the above 31. the biggest problem with communicating with aliens has been a. we don’t speak the same language b. cultural differences c. fear d. large distances between stars e. food preferences 32. comets typically a. have a nucleus that is 10000 kilometers in size b. have a dust tail and an ion tail c. have a greenish glow d. orbit the jovian planets e. none of the above 33. the drake equation has typically been used to estimate a. the number of stars in our galaxy b. the number of planets in the habitable zone of their stars c. the number of planets with primitive life d. the limited distance over which radio signals can be detected e. the number of communicating civilizations in our galaxy 34. the likely existence of primitive life on a planet may be inferred by detecting in its atmosphere. a. carbon dioxide b. carbon monoxide c. oxygen d. nitrogen e. methane 35. the most complex molecules on the list below that it has been possible to make with the miller - urey experiment is/are a. amino acids b. proteins c. dna d. water e. methane

Explanation:

• Question 30: The origin of life is a major unsolved problem for evolutionary science as it deals with how life first emerged.
• Question 31: The vast distances between stars mean that even if we detect signals or want to communicate, it would take an extremely long - time for messages to reach their destination, making communication a challenge.
• Question 32: Comets are known to have a dust tail and an ion tail. The dust tail is composed of solid particles, and the ion tail is made of ionized gas.
• Question 33: The Drake Equation is used to estimate the number of communicating civilizations in our galaxy by considering various factors such as the rate of star formation, the fraction of stars with planets, etc.
• Question 34: Oxygen in a planet's atmosphere can be a sign of biological activity as many life - forms on Earth produce oxygen through processes like photosynthesis.
• Question 35: The Miller - Urey experiment was able to produce amino acids, which are relatively complex organic molecules compared to water and methane, and are building blocks of proteins.

Answer:

1. A. the origin of life
2. D. large distances between stars
3. B. have a dust tail and an ion tail
4. E. the number of communicating civilizations in our galaxy
5. C. oxygen
6. A. amino acids