Author Question: What evidence suggests that life arises relatively easily? A) Life was present on Earth soon ... (Read 60 times)

jc611 · **on:** Jul 27, 2018

What evidence suggests that life arises relatively easily?

A) Life was present on Earth soon after the end of the heavy bombardment.
B) Life is currently present in extreme environments like deep ocean volcanic vents.
C) All organisms on Earth use DNA as their genetic material.
D) Tardigrades, small animals, can survive exposure to the near-vacuum of space.

Question 2

The Chandrasekhar limit is

A) the upper-mass limit for a white dwarf.
B) the temperature at which hydrogen fusion starts.
C) the point at which a planetary nebula forms.
D) the temperature at which helium fusion starts.
E) the lower-mass limit for a Type II supernova.