Mars has always been a favorite topic for the search for extraterrestrial life. What key feature needed for Martian life failed in Mars' past? Never had magnetic field Never had liquid water Atmospheric pressure too high Lacked ozone layer Greenhouse effect failed
1.
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Mars has always been a favorite topic for the search for extraterrestrial life. What key feature needed for Martian life failed in Mars' past?
Never had magnetic field
Never had liquid water
Atmospheric pressure too high
Lacked ozone layer
Greenhouse effect failed
2.
Beyond the usual carbon based life, and proposed life based on silicon, what other compound is interesting in SETI?
Germanium based life
Boron based life
Plasma based life
Ammonia based life
Weak force life
3 .
Extinction is a part of the evolutionary process, this accounts for which fact?
Over 99% of all species that have ever existed are now extinct
High number of species
Extinction events get smaller and smaller
No modern extinction events
Even rate of extinction
4.
DNA base pairs encode for what?
Starches
Carbohydrates
RNA base pairs
Codons
Amino acids
5.
Evidence of a universal common ancestor includes which fact?
All life on Earth uses the same 20 amino acids
Five domains of life
Only right handed amino acids appear in nature
Some life uses right handed amino acids
All species can interbred
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