Biology, 11.03.2021 21:10 stackpoolekrysp71si4
After the Earth developed a magnetic field and before single-celled photosynthetic organisms appeared on Earth, what was the atmosphere like? *
1 point
mostly hydrogen and helium
85% water vapor, 10% carbon dioxide, 5% nitrogen
78% nitrogen, 21% oxygen, 0.9% argon, 0.1% all other gases
there was no atmosphere before single-celled orgamisms
Answers: 3
Biology, 21.06.2019 13:30
Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called a. shield volcanoes. b. cinder cone volcanoes. c. composite volcanoes. d. lava plateaus. select the best answer from the choices provided a b c d i need asap
Answers: 1
Biology, 22.06.2019 04:00
Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone
Answers: 2
Biology, 22.06.2019 09:00
What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction
Answers: 3
Biology, 22.06.2019 11:00
Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?
Answers: 2
After the Earth developed a magnetic field and before single-celled photosynthetic organisms appeare...
Health, 03.04.2021 14:03
English, 03.04.2021 14:03
Social Studies, 03.04.2021 14:03
Computers and Technology, 03.04.2021 14:03
Physics, 03.04.2021 14:03
Social Studies, 03.04.2021 14:03
Physics, 03.04.2021 14:03
Geography, 03.04.2021 14:03
Mathematics, 03.04.2021 14:03
Chemistry, 03.04.2021 14:03
Mathematics, 03.04.2021 14:03
Chemistry, 03.04.2021 14:03
Mathematics, 03.04.2021 14:03
Mathematics, 03.04.2021 14:03
Mathematics, 03.04.2021 14:03
History, 03.04.2021 14:03