« previous next »

Author Question: The accumulation of free oxygen in Earth's atmosphere began A) with the origin o (Read 1233 times)

Jesse_J

  • Sr. Member
  • ****
  • Posts: 282
on: Jun 13, 2013
The accumulation of free oxygen in Earth's atmosphere began
A) with the origin of life and respiratory metabolism.
B) with the origin of photosynthetic bacteria that had photosystem I.
C) with the origin of cyanobacteria that had both photosystem I and photosystem II.
D) with the origin of chloroplasts in photosynthetic eukaryotic algae.
E) with the origin of land plants.


aero

  • Hero Member
  • *****
  • Posts: 512
Reply #1 on: Jun 15, 2013
I picked C and I got it right, good luck :)


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Jesse_J

  • Sr. Member
  • ****
  • Posts: 282
Reply #2 on: Jul 4, 2013
Thank you so much, I marked it solved ;D


« previous next »
 

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Possible Earth 5 billion years from now Possible Earth 5 billion years from now
Artist's conception of the New Horizons spacecraft passing over Pluto, showing its tenuous atmo Artist's conception of the New Horizons spacecraft passing over Pluto, showing its tenuous atmo
6-8 Earth’s Major Tectonic Plates 6-8 Earth’s Major Tectonic Plates
Close-ups of Jupiter’s Atmosphere Close-ups of Jupiter’s Atmosphere
Gibs free energy for hydrolysis of some phosphate compounds Gibs free energy for hydrolysis of some phosphate compounds
Atmosphere-ocean connection Atmosphere-ocean connection
Video: Electrocardiogram Examination

For a complete list of videos, visit our video library