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
Gala2k [10]
3 years ago
6

Oxygen levels first rose in the atmosphere because of _____.

Physics
2 answers:
tigry1 [53]3 years ago
5 0

<u>The answer to your question is going to be option "D."</u>


Oxygen levels first rose in the atmosphere because of (the last option, or "D') cyanobacteria. Cyanobacteria is a type of bacteria that can create toxins that are very dangerous to both humans and animals.


I hope this helps! :)

Umnica [9.8K]3 years ago
3 0

Hey there!

Your answer = D. Cyanobacteria

They gain their energy through the photosynthesis.

Hope this helped!


You might be interested in
Allison is looking through a telescope at an object in space. The object looks like a very small planet, and it does not have a
Verizon [17]

Answer:

Allison is probably looking at the asteroid.

Explanation:

  • Asteroids are the giant gas balls of inner solar system that are present in the space.
  • Asteroids orbits around the sun in very irregular ans strange path unlike the other planets.
  • This is also the reason why it's called as the minor planets.
  • It could have been comet but if it had been a comets he must have seen the tail but asteroids do not have any tail like structure.
8 0
3 years ago
Help me please !!!!!
bezimeni [28]

Answer:

confounding cause they had exposure to many programmes

8 0
3 years ago
Read 2 more answers
Why does the candle light has no shadow when light fall on it?​
andrezito [222]
Shadows are the absence of light, they are created when an object blocks light. In other words, shadows are the product of light particles, known as photons. These particles “bounce off” of the object without reaching the other side. Therefore light by itself will not form a shadow.
6 0
3 years ago
A 63 kg kg person starts traveling from rest down a waterslide 6.0 mm above the ground. At the bottom of the waterslide, it then
gladu [14]

Answer:

change waterslide according to question. and you are good to go. check photo for solve

5 0
3 years ago
Where does the energy that is used to ride a bicycle up a hill come from and how is it classified?
MariettaO [177]
Well when you eat you get energy and then you use it to ride up the hill sorry I don't know how it is classified
7 0
3 years ago
Read 2 more answers
Other questions:
  • Astronomers have discovered a planetary system orbiting a star, which is at a distance of 3.9 × 1014 m from the earth. One plane
    6·1 answer
  • A student lifts a set of books off a table and places them in the upper shelf of a book case which is 2 meters above the table.
    14·2 answers
  • How many "big c" calories does it take to raise the temperature of 2.00 l of water from 22.0 c to 40.0 c?
    10·1 answer
  • The rainbow is a result of a. Diffraction of the light.
    6·1 answer
  • Which of the following will cause an increase in gas pressure in a closed container?
    12·2 answers
  • A particle initially located at the origin has an acceleration of a 2.00j m/s2 and an initial velocity of v-6.00i m/s. (a) Find
    5·1 answer
  • How do cells maintain homeostasis
    5·1 answer
  • What elements had to be made in a supernova explosion?
    7·1 answer
  • . A cathode ray tube (CRT) is a device that produces a focused beam of electrons in a vacuum. The electrons strike a phosphor-co
    13·1 answer
  • Hello!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!