Question

one explanation of lifes origins suggests that meteorites gave way to life on earth. which of the following provides evidence to support this idea?
o a organic molecules form in earths atmosphere and travel through space in meteorites.
o b vesicles in meteorites and microspheres can maintain an internal environment and store and release energy like cells do.
o c some meteorites contain organic compounds that may be precursors to todays living cells.
o d meteorites contain full dna molecules, which self - replicate and pass on to future generations.

question 19 (1 point)
(01.03 mc)
which of the following is not believed by scientists to have been present in early earths atmosphere?
o a ammonia
o b free oxygen
o c methane gas
o d water vapor

Explanation:

For the first question:

• Option a is incorrect because organic molecules do not form in Earth's atmosphere and travel through space in meteorites in that way.
• Option b is incorrect as vesicles in meteorites and microspheres do not function like cells in the way described.
• Option c is correct. Some meteorites contain organic compounds (like amino acids etc.) which could be precursors to living cells.
• Option d is incorrect as meteorites do not contain full - fledged self - replicating DNA molecules.

For the second question:

• Early Earth's atmosphere had ammonia (\(NH_3\)), methane (\(CH_4\)) and water vapor (\(H_2O\)).
• Free oxygen (\(O_2\)) was not present in significant amounts in the early Earth's atmosphere. It was produced later by photosynthetic organisms.

Answer:

First question: C. Some meteorites contain organic compounds that may be precursors to today’s living cells.
Second question: B. Free oxygen.