Question 29 why is it unlikely that any life survived

Question 29
Why is it unlikely that any life survived the Hadean Eon?
Martians invaded the Earth at the end of the Hadean period
The Earth's surface was always very cold

10/12/2020 Quiz 1: AU20 ASTRON 1141 - Life in Universe (21773)
There was no carbon on the Earth during the Hadean
The Earth was hit repeatedly by very large debris, wiping out life
Correct!
Correct!
The Earth never had an atmosphere in the Hadean period
1 / 1 pts
Question 30
If we were an alien species observing Earth over billions of years, what would
we notice?
Correct!
Correct!
18/25
Complex anaerobic bacteria thrived after the oxygen holocaust
An oxygen-rich atmosphere is necessary for simple life to arise
1 / 1 pts
Question 31
Why was the oxygen holocaust helpful for supporting the metabolism of more
complex life?
Correct!
Correct!

10/12/2020 Quiz 1: AU20 ASTRON 1141 - Life in Universe (21773)
An oxygen-rich atmosphere protects the Earth from asteroids
If you have oxygen, you don't need water to survive
1 / 1 pts
Question 32
Each ____________________ has a unique chemical composition and crystal
structure.
19/25
1 / 1 pts
Question 33
The phylogenetic tree below shows the relationships between several species.
Which of the organisms shown is most closely related to Homo sapiens?

10/12/2020 Quiz 1: AU20 ASTRON 1141 - Life in Universe (21773)
20/25
Limpet
Starfish
Acorn Worm
Octopus
Sea turtle
Correct!
Correct!
1 / 1 pts
Question 34
The phylogenetic tree below shows the relationships between several species.
The octopus, human, and sea turtle all have eyes. The rest of the species shown
do not. Why is the presence of eyes in both humans and octopuses most likely
the result of convergent evolution?

10/12/2020 Quiz 1: AU20 ASTRON 1141 - Life in Universe (21773)
Most of the close relatives do not have eyes, so eyes developed
independently.
Only sentient organisms have eyes
All organisms on Earth have eyes
Natural selection always eliminates eyes
Hard-shelled organisms cannot have eyes
Correct! Correct!
21/25