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
Alex Ar [27]
3 years ago
13

Free oxygen formed on earth after

Biology
1 answer:
harina [27]3 years ago
5 0

Answer: (1) photosynthesis occurred

Explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.

You might be interested in
To assess Mendel's law of segregation using tomatoes, a true-breeding tall variety (SS) is crossed with a true-breeding short va
White raven [17]

Answer:

1. The chi-square statistic is 0. The p-value is 1. Not significant at p < .05.

The chi-square statistic with Yates correction is 0.0642. The p-value is .800028. Not significant at p < .05.

Explanation:

2. By generating large sets of data the ratio will remain same (F1 = 3:1, F2 = 9:3:3:1) according to the Chi-Square analysis. In actual reality, it fails to justify by giving a probability value of 1 that is impossible due to the exceptions of Co-Dominance and Incomplete Dominance...

3 0
3 years ago
The two chemical families to which most antipsychotic drugs belong are ____.​
Hatshy [7]

Out of the following given choices;

a.phenothiazines and butyrophenones<span>
b. tricyclics and MAOIs
c. nitrates and glucocorticoids
d. benzodiazepines and antihistamines</span>

The answer is a. butyrophenones work by inhibiting dopamine-mediated neuro-transmitters hence altering the normal thought pattern of its patients. They are more anti-dopamine (and less anti-adrenergic, anti-histaminic and anti-cholinergic) than phenothiazine but work in the same pharmacological way.

5 0
4 years ago
What’s a geographic variation in fossil record?
Debora [2.8K]
Geographical variation refers to differences among populations in genetically based traits across the natural geographic range of a species. ... In the simplest case, we divide these factors into purely genetic versus environmental components to tease apart their relative contributions to observed phenotypic variation.
6 0
3 years ago
Ideally, an observatory is located where nothing is present to interfere with incoming starlight. Which of these sites would be
Ivahew [28]

Answer:

I believe it would be the one orbiting above the atmosphere or on Venus

Explanation:

There are no artificial/man-made interferences and being outside of the Earth's atmosphere more starlight can reach the observatory.

3 0
3 years ago
Which factor would increase the food security of a community?
Lilit [14]
It’s d! hope it helps
4 0
3 years ago
Read 2 more answers
Other questions:
  • The nurse teaches the father of an infant hospitalized with gastroenteritis about the next step of the treatment plan once the i
    5·1 answer
  • PLZ HELP, WILL MARK BRAINLIEST
    13·2 answers
  • Which question about dogs could be answered through scientific investigation?
    5·2 answers
  • Calcium sulfide forms when calcium loses 2 valence electrons to sulfur. What type of a bond is formed? covalent ionic
    7·1 answer
  • Please put the Levels of Organization in order from highest to lowest.
    9·2 answers
  • Where does respiration take place?​
    14·1 answer
  • Help me with this, and i will mark brainliest
    5·1 answer
  • World War II created a
    12·1 answer
  • What is photosynthesis??<br>.<br>.<br>.<br>anyone Indian online here? ​
    9·2 answers
  • Write a parag<br>raph about importance of trees<br><br><br>​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!