Biology, 02.01.2020 13:31 griseldaguerree
How did cyanobacteria affect earth's early atmosphere?
a.
they replaced oxygen with carbon dioxide in the atmosphere.
b.
they eliminated the harmful ultraviolet rays of the sun.
c.
they replaced carbon dioxide with oxygen in the atmosphere.
d.
they absorbed ozone molecules from the atmosphere.
Answers: 1
Biology, 21.06.2019 19:00
Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.
Answers: 1
Biology, 22.06.2019 00:30
What was the land like over 500 million years ago? what was under the sea?
Answers: 1
Biology, 22.06.2019 01:00
When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection
Answers: 2
Biology, 22.06.2019 04:00
1) strawberry plants typically reproduce by making runners, which are miniature versions of themselves, that grow off of the roots and stems of the parent. this type of vegetative reproduction is known as a) pollination. b) fragmentation. c) binary fission. d) vegetative propogation.
Answers: 2
How did cyanobacteria affect earth's early atmosphere?
a.
they replaced oxygen with carbo...
a.
they replaced oxygen with carbo...
Mathematics, 30.06.2019 10:30
Health, 30.06.2019 10:30
Mathematics, 30.06.2019 10:30
History, 30.06.2019 10:30
Spanish, 30.06.2019 10:30
Social Studies, 30.06.2019 10:30
Chemistry, 30.06.2019 10:30
Spanish, 30.06.2019 10:30