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
san4es73 [151]
3 years ago
12

For what reasons is it believed that oxygen was not present when life formed from earth

Biology
1 answer:
alex41 [277]3 years ago
7 0

Explanation:

Why (for what reasons) is it believed that oxygen was not present when life formed on Earth? The life forms were anaerobic, and did not make oxygen. There is a lack of oxidized iron in rocks that are a few billion years old. Eventually oxygen from the oceans moved into the atmosphere, and iron could be oxidized.

You might be interested in
What tools do marine scientists use to make observations about oceans and marine organisms
Sunny_sXe [5.5K]

The tools used by marine scientists to make observations about oceans and marine organisms are Remote Operated vehicle (ROV), Automated untethered Vehicle (AUVs), Global positioning system (GPS) and Human-occupied vehicle (HOV).

<h2>Further Explanation </h2>

ROV mean Remote operated vehicle which allows marine scientists to explore the ocean without necessary being in the ocean. Remote Operated Vehicle is a robot that is controlled by a person on the ship.

It is connected to the ship and the person that controls it uses joystick, which is similar to how we play a video game. It has a still camera, video camera and lights used to transmit videos and images back to the ship.  

Automated untethered vehicles (AUVs) are untethered, unmanned vehicles that are used by marine scientists to conduct underwater research. Through Micromodem, an operator controlled computer passes information or command to AUVs in regards to when, where and what they sample. AUVs use different types of equipment for surveying and sampling such as sonar, camera and depth sensors.

Global positioning system (GPS) receiver is a navigation system that is used to show the location of the ship. GPS provides accurate navigation information for marine scientists.

Human occupied vehicle (HOV) also known as manned submersibles have the capacity to reach the full-depth of the ocean. It is used by marine scientists to carry out geophysical, geochemical, and biological studies, viewing and sampling of organism.

It has high quality video imaging system and can produce 3-D movies. It also has sophisticated syntactic foam.

LEARN MORE:

  • marine scientists and tools brainly.com/question/10867274

KEYWORDS:

  • marine scientists
  • marine organisms
  • human occupied vehicle
  • global positioning system
  • remove operated vehicle
  • Automated untethered vehicles
7 0
4 years ago
Read 2 more answers
PLEASE HELP ME <br>Fungi can be helpful to other organisms by...
brilliants [131]

Answer: Mutualism

Explanation: Fungi have a lot of mutualistic relationships with other organisms. When we say mutualism, both organisms benefit from this relationship. A common example of a mutualistic relationship involving fungi is the mycorrhiza, a mycorrhiza is a mutualistic relationship between a fungus and a plant.

5 0
3 years ago
Read 2 more answers
Which best illustrates the result of the process of meiosis?
Ghella [55]

“A daughter looks different from both her mother and her father” best illustrates the result of the process of meiosis.

 

Meiosis<span> is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.</span>

 

The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

6 0
3 years ago
Controlled nuclear chain reactions ____.
inna [77]
<span>Answer: a. take place in nuclear reactors

</span><span>Controlled nuclear chain reactions are the reaction in nuclear reactors. The reaction is controlled to make its rate slower. This will make the reaction relatively safer, so the energy produced can be changed into electricity in power plant. When the reaction is not controlled, it could cause explosive like in nuclear bomb.</span>
3 0
4 years ago
Read 2 more answers
Which term completes the sentence given below?
Serhud [2]

Answer:

Maybe animals that have been resurrected or cloned

Explanation:

hope it helped

4 0
4 years ago
Other questions:
  • What is the normal range of blood pressure
    15·2 answers
  • How does the structure of the corn leaf differ from that of the dicot leaf?
    15·1 answer
  • Nerves impulses _____. start at the dendrite are electrical signals can travel backwards and forwards are only found in the auto
    10·1 answer
  • Flowers are collections of reproductive and sterile tissue arranged on a stem tip in a tight array with very short ______
    10·2 answers
  • The image above shows particles in a medium. Which of the following shows the best
    12·1 answer
  • Cells are usually very small. Why is it an advantage to have many small cells instead of one very large cell?
    5·1 answer
  • The main difference between an ecosystem and a community is-
    15·1 answer
  • Which example listed below is not a population?
    5·2 answers
  • Here is an image of the mitochondria. Mitochondria numbers can differ between cell types based on the function of the cell. Whic
    7·1 answer
  • What is photosynthesis?<br><br>is anyone free to talk?​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!