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
Shkiper50 [21]
4 years ago
8

The oxygen build-up in the atmosphere was caused by

Biology
1 answer:
Y_Kistochka [10]4 years ago
3 0

Answer:

Actually, The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago. Harmful cyanobacteria blooms may affect people, animals, or the environment by: y blocking the sunlight that other organisms need to live. Cyanobacteria blooms can steal the oxygen and nutrients other organisms need to live. y making toxins, called cyanotoxins.

Explanation:

You might be interested in
Which of the following does NOT negatively affect the health of a watershed?
Gnom [1K]
I’m pretty sure the answer is C
3 0
2 years ago
How many genotypes are in TT times tt
svetlana [45]

Answer:

4 possible genotypes (or 3, depending on if you count the last 2 as one)

Explanation:

TT, tt, Tt, tT

5 0
4 years ago
Assume that you are looking at a case of lethal alleles. Crossing two green corn plants results in 2/3 green progeny. If you cro
Rzqust [24]

Answer:

2/3 of the progeny would be green

Explanation:

Lethal alleles means that their presence result in death of the organism

Assuming this Lethal allele is recessive --> a

This way, if there is AA or Aa the plant will survive, otherwise if there is aa the plant will not survive    

Than, assuming AA is a progeny white and Aa is green

Aa x Aa

2/3 Aa - Green

1/3 - White

1/3 - plant will not survive

Crossing 2 green progeny with each other

Aa x Aa

2/3 - Green

5 0
3 years ago
The contracting and relaxing of muscle is regulated by the amount of calcium present in the cells of muscle fibers. These cells
Marizza181 [45]
The choices can be found elsewhere and as follows:

<span>Osmosis
Active Transport
Passive Transport
Facilitated Diffusion

I think the correct answer is the second option. The process that would be necessary is active transport. </span><span>Transport of materials against the concentration gradient requires energy which is active transport.</span>
8 0
3 years ago
Read 2 more answers
What challenges do hydrostatic pressure creates for marine scientists
KengaRu [80]

Answer:

The oceans are present on the 70 percent of the world but only 5 percent of the total oceans are explored yet.

There are many reasons of this problem but the most important is the hydrostatic pressure.

Hydrostatic pressure can be described as the pressure or weight exerted by the water on the object.

With every increase in 10 meters the pressure increase by 6.47kg (14.27lbs) each square inch of surface.

Due to extreme pressure, oxygen level in the cells of body fluctuates and person becomes unstable and can become unconscious.

4 0
3 years ago
Other questions:
  • Which organisms are most likely to survive in a population in which disruptive selection is occurring?
    6·1 answer
  • The process by which a bacteria cell divides into two identical cells is called
    15·2 answers
  • What would happen if mitochondria were absent?
    13·2 answers
  • When a plant generates food through photosynthesis, this food
    12·2 answers
  • Can someone please help me I need the answer and don’t understand? Thanks
    13·1 answer
  • What is it when homologous pairs line up randomly on the metaphase plate during meiosis to increase genetic diversity​
    5·1 answer
  • What movement of plates cause a earthquake
    6·2 answers
  • Relief includes all of the geographic features or landforms in a region?
    8·1 answer
  • What part of the oil palm tree do we get palm oil from
    6·1 answer
  • Natural selection results and change over time by acting on trates that are???
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!