1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ANTONII [103]
3 years ago
15

How did Earth's atmosphere become oxygen-rich?

Biology
1 answer:
bekas [8.4K]3 years ago
4 0

D. Biological activity

Explanation:

The earth's atmosphere became oxygen rich as a result of biological activities. Early earth atmosphere was toxic one and in its reducing state.

  • The activities of micro-organisms such as cyanobacteria led to the production of oxygen.
  • These organisms manufacture their food in the presence of sunlight and water in the process of photosynthesis.
  • The bye product of this reaction is oxygen.
  • The intense presence of these living organisms led to the surge in atmospheric oxygen.

Learn more:

Photosynthesis brainly.com/question/4216541

#learnwithBrainly

You might be interested in
What did Sumerians believe? CHOOSE ALL ANSWERS THAT ARE CORRECT A. The Sumerians believed it was their responsibility to keep th
Anna11 [10]

What did Sumerians believe? CHOOSE ALL ANSWERS THAT ARE CORRECT​

​Answer : A.) and B.)

A.) The Sumerians believed it was their responsibility to keep the gods happy.​

B.) The Sumerians believed in many gods.

​Hope this helps!​​​​

​\textit{\textbf{Spymore}}​​​​​​

6 0
4 years ago
Read 2 more answers
Which of the following is associated with extracellular digestion caused by release of the lysosomes enzymes into the environmen
Rudik [331]

Answer: Rheumatoid arthritis

Explanation:

Rheumatoid arthritis is a disease which is a autoimmune disease which is usually associated with the pain and inflammation in the joints. This is the condition in which the person is not able to walk or sit for a longer period of time as it is painful.

The lysosomes is an enzyme that is found in the saliva and tears of human beings which helps in the degradation of the cell wall.

In case of autoimmune diseases the antibody present in the body destroys the cells of the body considering it as self antigen. Its concentration is found high in the people suffering from this autoimmune disorder.

8 0
3 years ago
Why do animals become adapted to their environments?
marin [14]

Answer:

For survival

Explanation:

All organisms need to adapt to their habitat to be able to survive. This means adapting to be able to survive the climatic conditions of the ecosystem, predators, and other species that compete for the same food and space.

Hope this helps:)

3 0
3 years ago
What must take place in the lungs prior to the newborn's first breath? A. Blood must be drained from the alveolar capillaries B.
Iteru [2.4K]

Answer: Drainage or absorption of amniotic fluid

Explanation: Amniotic fluid act as a cushion to a growing foetus and provides the foetus with nutrients and biochemical products from the mother via the blood vessels of the placenta. When the date of baby delivery grows closer the lungs absorbs some of the fluid. Soon after birth the newborn's first step to independence begins with breathing on its own.They gasp and cry taking in air that fills the lungs. This expels the remaining amniotic fluid that was in the lungs and begins its own independent breathing.

3 0
3 years ago
Which scientist demonstrated that the green parts of plants absorb carbon dioxide and release
BARSIC [14]
Jan Ingenhousz discovered photosynthesis

6 0
3 years ago
Other questions:
  • The Virginia Coastal Zone Management Program was approved by NOAA in 1986 and its goals include protecting coastal resources, ai
    8·2 answers
  • Can i get some help on this please ​
    7·2 answers
  • Ayuda :,v en esta prueba de biología :,3
    9·1 answer
  • 10 pionts! What term refers to the energy that travels through space in waves (this incudes radio, micro, infrared, visible ligh
    14·2 answers
  • Plants that grow in low moisture climates have
    9·1 answer
  • How do plants and fish impact the pH of the lake?
    14·2 answers
  • Which of the following does not result in a cell with a new genetic
    14·2 answers
  • Eggs and sperm are called gametes. What problem would result if gametes were diploid?​
    10·2 answers
  • You first use PCR to amplify the fragment so that there is sufficient DNA for sequencing. You carry out dideoxy sequencing and t
    15·1 answer
  • Which field seeks to discover the influence of environment and heredity on individual differences in human development?.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!