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
Leto [7]
2 years ago
15

Earth's early atmosphere was primarily composed of

Biology
1 answer:
Paul [167]2 years ago
5 0

Answer:

The correct answer is ''carbon dioxide, water vapor and nitrogen.''

Explanation:

About 4.5 billion years ago, Earth was a very geologically active planet. So many volcanic fumes formed the primitive atmosphere, which was mostly made up of water vapor, carbon dioxide, sulfur, and nitrogen. At this point, oxygen was barely present and the oceans did not yet exist. The primitive atmosphere is the one before the Precambrian, it was reductive, that is, it lacked free oxygen, and only had ammonia, methane and hydrogen, the high temperature of the atmosphere in its early stages facilitated the reaction of these gases to form organic compounds from which life may have emerged. UV rays passed, because ozone did not exist.

You might be interested in
Which process is a common practice that has been used by farmers for hundreds of years to develop new varieties of plants and an
DochEvi [55]

Answer: Farmers use selective breeding for desirable traits. This is considered a type of genetic manipulation.

Explanation:

3 0
3 years ago
PLEASE HELP I WILL GIVE BRAINLIEST, 5 STARS, A LIKE, AND A FOLLOW PLEASE ANSWER CORRECTLY​
Mama L [17]

Answer:

-The three main types of muscle include skeletal, smooth and cardiac.

- Skeletal muscle – the specialised tissue that is attached to bones and allows movement. ...

Smooth muscle – located in various internal structures including the digestive tract, uterus and blood vessels such as arteries. ...

Cardiac muscle – the muscle specific to the heart.

-Skeletal muscles are attached to the skeleton by tough connective tissues called tendons

-Many skeletal muscles are attached to the ends of bones that meet at a joint. The muscles span the joint and connect the bones. When the muscles contract, they pull on the bones, causing them to move.

-They are lightweight yet strong and hard, and serve multiple functions.

-The joints help attach bones to one another to provide flexibility & allow the muscles to help give the bones a way to move.

- The nervous system helps all the parts of the body to communicate with each other.

-Your nervous system uses specialized cells called neurons to send signals, or messages, all over your body.

-homeostasis?

Receptors in muscles provide the brain with information about body position and movement. The brain controls the contraction of skeletal muscle. The nervous system regulates the speed at which food moves through the digestive tract.

ive listed the answers in order. hope this helps :) i will appercite if you give me brainliest.

Explanation:

5 0
2 years ago
Which type of muscle is paralyzed when it's nerve supply is absent?
kondaur [170]
I would say almost all types of muscles. Skeletal, cardiac, or smooth, they all need neurons. Without them, it could cause flaccid and spastic paralysis, or other types of diseases.
4 0
3 years ago
What is the right answer
777dan777 [17]

Answer:

B

Explanation:

5 0
3 years ago
What clean water regulation do you think has had the greatest impact on water quality in the United States? In a 3-5 sentences,
Kay [80]

Answer:

The Clean Water Act (CWA) can be considered as one of the effective program which impacted the water quality in the United States. Under this Act, quality standards for surface water were generated.

This Act has set wastewater standards for the industries and it ensures that industries do not pollute the clean water. The Clean Water Act (ACT) made it unlawful to discharge any pollutant in waters and set a fixed amount for it. Beyond that amount, polluting water is considered to be illegal.

6 0
3 years ago
Other questions:
  • Which of the following correctly describes the importance of the carbon cycle?
    5·2 answers
  • Describe the Synthesis of a protein from amino acids
    15·1 answer
  • Choose all the answers that apply.
    11·2 answers
  • He organization of a cell could be compared to a small city. All of the organelles inside of the cell have a specific purpose th
    15·1 answer
  • Which explains why it is important to eat a full healthy meal before an afternoon of playing sports?
    11·2 answers
  • Describe what happens during prophase I and metaphase I
    13·2 answers
  • if environmental conditions change over time it’s most likely a population of organisms in the environment will survive if...
    9·1 answer
  • What is the most popular gamefish in Florida
    6·2 answers
  • PLEASE HELP<br> What is a limiting layer and what does it prevent?
    9·1 answer
  • Producers, such as those that make the foods that are shown below, make glucose during the process of photosynthesis.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!