Which of the following was not a challenge for survival of the first land plants? 

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#Question id: 20155

#XL - P Chemistry

The energy of hydrogen atom in its ground state is -13·6 eV. The energy of the level corresponding to the quantum number n = 5 is

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#Question id: 4942

#XL - T Zoology

Which of the following has not yet been synthesized in laboratory experiments studying the origin of life?

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#Question id: 19631

#XL - P Chemistry

When NH4Cl is added to NH4OH solution the dissociation of ammonium hydroxide is reduced. It is due to:

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#Question id: 407

#XL - S Microbiology

The reaction A + B -> C has a DG'° of –20 kJ/mol at 25° C.  Starting under standard conditions, one can predict that:

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#Question id: 20129

#XL - P Chemistry

When does the reaction occur spontaneously on the basis of the relation ΔG° = –RT/nK?