Can there be life on Mars? Is there proof that life existed on Mars? Defend your answer
What will be an ideal response?
There was a splash of news stories in the 1990s regarding supposed chemical and physical traces of life on Mars discovered inside a Martian meteorite found in Antarctica. A research group claimed that the meteorite contained chemical and physical traces of ancient life on Mars, including what appear to be fossils of microscopic organisms. That evidence has not been confirmed, and the claim continues to be tested and debated. From reviewing spectrographs of the Martian atmosphere, methane is most abundant in locations apart from volcanic regions, indicating the methane might be produced biologically.
Although measurements by the Curiosity rover have proven conclusively that Mars once had an environment that could have supported Earth-like life, evidence of life on Mars may have to wait until a future rover drills into the soil and discovers signs of metabolizing organisms, or a geologist astronaut scrambles down dry Martian streambeds and cracks rocks open to find fossils.
There is presently no compelling evidence for the existence of life in the Solar System other than on Earth.
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If two polymers mix in the liquid state, this is called a(n) _________.
Fill in the blank(s) with the appropriate word(s).
An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ
Metals are both good heat and electrical conductors due to
A) similar thermal and electrical conductive properties. B) looseness of outer electrons in metal atoms. C) relatively high densities of metals. D) high elasticity of metals. E) ability of metals to transfer energy easily.
A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW
If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)