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
If a cell contains 40% glucose what is the rest of the cell made up of ?
Lerok [7]
If it’s 40% glucose then it will be 60% water
7 0
3 years ago
Why are so many starch grains found in the cortex?
rosijanka [135]

There are many grains of starch in the cortex because it represents the reserve food material of plants.

This source of food material is consumed during plant metabolism, as food when plants are under stress, or as an energy source in seed germination and early seedling stages.

The cortex, in plants, is a vascular tissue responsible for the transport of food (processed sap) from the leaves to the rest of the plant .

Starch grains are the most common solid particles that plant cells develop within plastids.

Assimilation starch is a temporary product of photosynthesis and is formed in chloroplasts, while reserve starch is formed in amyloplasts, which are contained in parenchymal cells of the cortex, in vascular tissues of stems and roots, in the pith of stems, in fruits, leaves, fleshy cotyledons and in modified stems, such as tubers and rhizomes.

Starch is the main energy and carbon reserve in plants, supplying the energy and carbon skeletons necessary for the plant's metabolism during periods of darkness, when photosynthesis is inactive.

Therefore, we can conclude that starch grains (ergasstic substances) are found in abundance in the cortex because it represents a reserve of essential molecules for the functioning and maintenance of the cellular structure.

Learn more here: brainly.com/question/18303563

4 0
3 years ago
What is mitosis, HURRY PLEASE
a_sh-v [17]
<span>In cell biology, mitosis is a part of the cell cycle when replicated chromosomes are separated into two new nuclei.</span>
4 0
3 years ago
When transforming bacterial cells, a researcher is interested in generating bacteria that exogenously express the gene that enco
maks197457 [2]

Answer:d

Explanation:

8 0
3 years ago
Individual flowers of a certain species vary in the time when they bloom. Flowers that bloom too early or too late might not be
Zepler [3.9K]

Answer:

umm 2004 a b  c d

Explanation:

make me brainliest

5 0
3 years ago
Other questions:
  • When nitrate is reduced to dinitrogen gas (n2), nitrogen is removed from the ecosystem and returned to the atmosphere through a
    13·1 answer
  • A 17 year-old female has a bone marrow biopsy for examination as a potential volunteer stem cell donor for her mother who has ac
    11·1 answer
  • Landforms formed by molten materials are ____ mountains.
    10·2 answers
  • Which allele is expressed in a heterozygous individual?
    11·2 answers
  • The flower pictured above is the reproductive part of a plant. Reproduction takes place in plants and humans in different ways.
    9·1 answer
  • Which molecules of the adaptive defense system provide humoral immunity by circulating freely in the blood and lymph, where they
    15·1 answer
  • Jeffrey wants to lose weight by using caffeine to
    6·1 answer
  • The chart below compares the characteristics of four different cells.
    8·1 answer
  • Why is my nipple leaking fluid like a yellowish and im male and 14. Only happens if I squeeze it.
    5·2 answers
  • Which stage is the last stage of speciation? Question 5 options: The populations become adapted to different environments and ev
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!