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
forsale [732]
3 years ago
13

The first organisms that performed photosynthesis evolved about 2.2 billion years ago. During the next few million years, their

actions caused which of these events?
A. an increase in oxygen levels, which led to the extinction of many anaerobic organisms
B. a decrease in oxygen levels, which led to the arrival of the first anaerobic organisms
C. an increase in carbon dioxide levels, which led to a warmer climate
D. a decrease in carbon dioxide levels, which led to the first ice age
Biology
1 answer:
frosja888 [35]3 years ago
8 0

Answer:

A

Explanation:

an increase in oxygen levels

You might be interested in
The bedrock of the adirondack mountains was formed mainly by the
MatroZZZ [7]
There are choices for this question namely:

a. cementation of clastic sediments and precipitates from seawater 
<span>b. compaction and recrystallization of volcanic material </span>
<span>c. regional metamorphism of sedimentary and igneous rocks </span>
<span>d. contact metamorphism of unconsolidated gravel 
</span>
The correct answer is that the bedrock of the Adirondock mountains is formed mainly by regional metamorphism of sedimentary and igneous rocks. The geology of the Adirondock mountains formed around 5 million years ago with rocks  over 1000 million years old. At this very ancient age, the sedimentary and igneous rocks in the Adirondock mountains have undergone extensive heat and pressure hence regional metamorphism of the existing sedimentary and igneous rocks.
7 0
3 years ago
What will eventually happen as the earth's core cools down over billion of year?
Olenka [21]
The planet would growl and die . Also our magnetic shield would be gone and that would allow for cosmic radiation to hit the earth
8 0
3 years ago
The U.S. National research Council recommends that adults eat 0.8 g of protein daily per kilogram of body weight. What is the mi
faust18 [17]

Explanation:

For a man weighing 185 pounds his minimum daily protein requirement is <u>67.118 g </u>of protein.

Proteins are integral to many bodily functions including cell growth,repair and as an alternative source of energy.

Further Explanation:

Large monomer chains form biological macromolecules that perform many essential body functions, including nucleic acids, carbohydrates, proteins, and lipids. These are organic molecules, meaning Carbons bonded to the elements oxygen (O), hydrogen (H), nitrogen (N), and phosphorus (P) are ringed or long-chain.

Proteins are structural support molecules consisting of long amino acid chains joined via peptide (CONH) bonds; these are 20 specific units arranged into several macromolecules. Amino acids are absorbed through digestion and incorporated into the cells of the body to form muscle organs that signal molecules and provide an alternative source of energy.

  • First... convert 185 pounds to kilograms. Pounds (lbs) can be a measure of mass or weight, while Kilograms (kg) are a measure of mass.  
  • 1 pound= apprx 0.4535 kilograms.   ∴ 185 lbs = 83.8975 kg
  • Then, find the daily requirement for the person's mass in kg .....................<em>0.8 grams (g) of protein is recommended per kg of body weight.       </em>∴ 0.8 × 83.91 = <u>67.118 g</u>

Learn more about proteins and carbohydrates at brainly.com/question/10744528

#LearnWithBrainly

8 0
3 years ago
What is the sequence of bases on DNA strand b from left to right<br> (See picture)
VLD [36.1K]

Answer:

DNA sequence from left to right

T G A G G A C T T

Explanation:

There are four DNA nitogenous base they include thymine, guanine, cytosine and Adenine. The Nitrogenous bases are complementary that is Adenine is complementary to thymine and cytosine is completely to quanine and they both can replace each other in this manner A-T,C-G and it means that Adenine can pair with thymine and cytosine can only pair with guanine. DNA is known as Deoxyribonucleic acid. DNA sequencing are shown usually from the 5' end to the 3' end . The sense strand in DNA is used in DNA sequences and also it has the antisense strand and also called the coding strand and the non-coding strand are information are contained in the sequence

3 0
4 years ago
Read 2 more answers
Claim and evidence:
puteri [66]

It would happen that the effectiveness of an original vaccine could become less if there was a mutation in the virus that caused the protein spike to change because the antibodies created would not be specific for the new virus.

<h3>What would happen to the mutated virus?</h3>

Vaccines trigger an immune response to fight disease-causing organisms, a mutation in the virus to be fought would change the effectiveness of this immune response, as the specificity would not be the same with the mutant virus.

With this information, we can conclude that The immune response would not be specific for the new virus that caused the protein spike to change.

Learn more about Vaccines in brainly.com/question/6683555

#SPJ1

4 0
2 years ago
Other questions:
  • Which of the following does not occupy the bottom of an energy pyramid?
    9·2 answers
  • What is included in key waterways in the South during the Civil War?
    13·2 answers
  • By how much did carbon dioxide levels increase from 1980 to 2000?
    6·1 answer
  • Microorganisms are involved in
    13·1 answer
  • Which of the following stages of regulatory control in eukaryotes largely occurs in the cytoplasm, outside of the nucleus?
    11·1 answer
  • It is important to remove any big air bubbles from the microtubes prior to incubation. Otherwise, the bubbles could:_______.
    5·1 answer
  • Which type of organism is used to make bread rise when baking?
    13·1 answer
  • Identify the structures of the female reproductive system using the drop-down menus. This structure is also called the birth can
    11·2 answers
  • Vision and hearing are generally believed to be the most highly prized senses. What would your life be if you lost any one of yo
    12·1 answer
  • What is the name of the process that plants use to remove carbon dioxide from the atmosphere?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!