1. 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 failed2. 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 life3 . 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 extinction4. DNA base pairs encode for what? Starches Carbohydrates RNA base pairs Codons Amino acids5. 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

The solar system is the gravitationally bound system around the sun. It has 8 planets, moons revolving around the planets, comets, asteroids, etc.Mars is the next planet to the Earth and the fourth planet from the Sun. It is a major planet of interest for scientists due to its few similar features to earth. Mars is smaller than the Earth but they are the almost same age. However, Mars have very different properties compared to the earth, which is why, Mars can not support life on it. One of the major reason why Mars can not support life is due to the absence of greenhouse effect. The atmosphere of mars is so thin and with such low concentration of greenhouse gases that it can not have greenhouse effect. That is why the temperature on Mars can not be balanced. That is why life can not exist on Mars. Therefore, the correct answer is option e.Mars had magnetic field, which weared out when the internal heat started to get lost, which led to the solidification of the inner molten core of Mars. And also the liquid water that ever existed on Mars is now trapped as ice. Therefore, option a and b are wrong answers. The atmospheric pressure on Mars is very low as the composition and density of Mars's atmosphere is low. And it does have a ozone layer. Therefore, option c and d are incorrect answers.

Answered: Mars has always been a favorite topic…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Question

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

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

DNA base pairs encode for what?

		Starches
		Carbohydrates
		RNA base pairs
		Codons
		Amino acids

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