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
Artemon [7]
3 years ago
11

Oxygen was initially created in Earth's atmosphere by _____. volcanoes outgassing cyanobacteria photosynthesizing greenhouse eff

ect Ozone breaking down
Biology
2 answers:
VikaD [51]3 years ago
7 0

The answer might be Cyanobacteria photosynthesizing

SCORPION-xisa [38]3 years ago
6 0

The correct answer is B. Cyanobacteria photosynthesizing

Explanation:

Oxygen is a chemical element necessary for most life forms to exist, this includes most animals as they require oxygen for multiple body functions. This element is nowadays one of the most abundant elements in the atmosphere and due to this, life forms are abundant and diverse; however, before photosynthetic organisms oxygen was not part of the Earth's atmosphere. This can be explained as organisms that rely on photosynthesis, use carbon dioxide, water, and sunlight and release oxygen into the atmosphere. Due to this, it is believed oxygen in the atmosphere was the result of cyanobacteria and other primitive organisms that carried out photosynthesis.

You might be interested in
The diagram below shows a food web in a woodland.
gregori [183]
Y is the best options because a secondary consumer will eat a primary consumer for energy (the grass hopper).
7 0
2 years ago
The Neanderthal skeleton known as the "old man" showed evidence of many injuries over a long life. Several broken bones had heal
Citrus2011 [14]
The answer is C: <span>The Neanderthals cared for the wounded and the elderly. The fact that the skeleton showed signs of broken bones that had healed indicated that the individual had been nurtured back to health after injury. The loss of teeth showed that the individual had lived to an old age.</span>
3 0
3 years ago
Karen's blood type is b+. Jeremy's blood type is a+. Karen and jeremy have a child together, tommy. Tommy's blood type is o
Sophie [7]

It is possible for a child to have the blood type O if the parents have A+ and B+. However, this blood type has the lowest probability of occuring (6.25%),

The highest probability for an offspring with parents like Karent and Jeremy is AB with a chance of 56.25%. Next are A and B each with a chance of 18.75%.

However, if one of the parents is AB, then the chances for an offspring with O blood type is zero.

5 0
3 years ago
What three cellular components are present in both prokaryotes and eukaryotes?
Ivanshal [37]

Answer:

dam looks hard

Explanation:

6 0
3 years ago
Air pressure depends on which of the following
Crazy boy [7]
Answer:
Air pressure depends on how heavy the air above is. So the heaver the air above the stronger the pressure below:P
4 0
3 years ago
Other questions:
  • Classfication of living being is necessary justify​
    15·1 answer
  • In garden peas the allele for tall plants () is dominant over the allele for dwarf plants() A true breeding tall plant is bred w
    11·1 answer
  • What is the expected phenotypic ratio of the offspring of a a BbPp*BbPp cross if these alleles sort independently?
    14·1 answer
  • The ________ requires property owners to pay to clean up waste that is hazardous
    12·1 answer
  • Which cell type can specialize into any other type of cell in the body?
    14·1 answer
  • Which process moves water molecules across the membrane of a cell?
    11·2 answers
  • How are blue and red litmus papers alike?
    8·2 answers
  • PLS answer I NEED HELP!!!!!!!!!!!!!!!!!!!!
    7·1 answer
  • Exposed to the same conditions as the experimental group, except for one independent variable.
    6·1 answer
  • Two consecutive even positive integers have a product of 2,400. What is the smaller of the two numbers?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!