Unity and Diversity A.1 Water (id: 732337491)

本题目来源于试卷: Unity and Diversity A.1 Water，类别为 IB生物学

[问答题]
The diagram shows a solarnonks5ad:2y5h-o lu: 0 eu -na system very similar to ou*bul w8i iwnk-/o 3b8krs, where five planets orbit a ce/ikubb8o3-ni*w k w l8ntral star.


1.Define the term “Goldilocks zone”.

2.1.Label with the letter R the planet that is least likely to have extraterrestrial life present.

2.2Explain reasons for your answer to part (i).

3.1.Some of the planets in this solar system have water present on them. Suggest where this water might have come from.

3.2.Explain why the planets referred to in part (i) have retained water, whereas others in this solar system have not.

4.Suggest one other biological molecule, other than water, that may be a sign of life on a planet.

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