Q1 A common feature of all life on Earth is... Q2 If
extraterrestrials had visited Earth at some random time between
the Earth's formation and now, what kind of life forms would
they most likely have found stone age humans humans with radio
telescopes dinosaurs and insects Q3 Which of the following ideas
is NOT being discussed as a possible explanation for the origin
of life on Earth? life originated in a "warm primordial soup" -
possibly in tide pools life originated several kilometers
beneath the surface of the Earth or at the bottom of the oceans
near hydro-thermal vents life on Earth came from Mars life on
Earth originated on the Moon Q4 The age of the Universe, the age
of the Earth and the age of the earliest evidence for life on
Earth are respectively (in billions 1000, 100, 5 50, 10, 4.1 13,
4.5, 3.8 1.1, 0.6, 0.5 Q5 The Earth's atmosphere contains about
80% nitrogen and 20% oxygen. The oxygen that we breathe... came
from volcanic emission came from cow digestive tracts is
generated by ozone depletion