History of Life on Earth Flashcards
1
Q
Precambrian Period
A
is was the period when the first life forms appeared
2
Q
Paleozoic Period
A
the first land plants and vertebrates
3
Q
Mesozoic Period
A
the first cone-bearing and flowering plants, dinosaurs, first birds and mammals
4
Q
Cenozoic Period
A
modern plants and animals, humans
5
Q
What was the name of the first kind of bird?
A
the archeopteryx
6
Q
Nature of Life on Earth
A
the Earth appeared about 4.6 billion years ago, the first life form appeared 3.5 billion years ago, and the early atmosphere of the earth did not allow a lot of food or life
7
Q
Earth’s early atmosphere
A
it was poisonous, made of many harmful gasses and water vapor with little to no oxygen
