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
kvv77 [185]
3 years ago
6

how can scientists accurately compare atmospheric composition today with atmospheric composition thousands of years ago?

Biology
1 answer:
Vinil7 [7]3 years ago
3 0

Answer:

They accurately compare the current atmosphere with the previous one, by assessing the amount of atmospheric gases present today, with the amount of atmospheric gases trapped in ice cores that they believe are millennial, that is, they have existed for thousands of years ago.

Explanation:

As we know, it is difficult to compare current characteristics of the planet earth with characteristics that the planet had in the past, thousands of years ago. This is because the ancient characteristics on earth are not fully available to be analyzed, since most of them have been modified over time.

To do this, scientists need to find factors that may have existed thousands of years ago and assess whether these factors have any account of the characteristics of the earth. In the case of atmospheric characteristics, it is common for scientists to compare the current atmosphere with the atmosphere of thousands of years ago, with the assessment of the amount of atmospheric gases trapped in ancient ice cores, with the amount of atmospheric gases present in the atmosphere today.

You might be interested in
Check all that apply as characteristics of myelinated axons. Check All That Apply Myelinated axons transmit nerve impulses via c
stiv31 [10]

Answer:

Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.

Myelinated axons are more energy efficient than unmyelinated axons.

Explanation:

Neurons are cells that specialize in transmitting messages to each other using a type of electrical signal. These signals carry information from outside your body to the brain, while others are the instructions for the various organs, glands and muscles to carry out functions.

Neurons receive these signals from other neighboring neurons through their dendrites. The signal then travels to the soma of the neuron, which is the main body of the cell, and finally<u> travels down the axon to the synaps</u>e (space between the end of a neuron and another cell). The axon is a neuronal extension through which the electrical signal travels, extending from the soma to other neurons.

<u>There may be layers of myelin, which consist of a layer of fat, covering the axons and where they have the function of acting as insulators to help keep the electrical signal inside the cell, which makes it move faster increasing the speed of transmission of the nerve impulse</u>.

1) Myelinated axons transmit nerve impulses via continuous conduction. FALSE. In the axon, nodes of Ranvier are found at regular intervals along the length of the axon in the myelin sheath that surrounds it. These are small spaces that expose the axon membrane to the extracellular fluid and serve to allow the nerve impulse to travel faster, in a jumping manner and with less chance of error.

2) Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. FALSE. In an unmyelinated axon, the movement of voltage across the membrane is due to ion flux that is limited by the time it takes for sodium ions to diffuse into the axon. Myelinated axons conduct faster because they are shorter than unmyelinated axons. In the latter, transmission is continuous but slower.

3) Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. TRUE. The action potential conduction jumps from node to node, thereby they need fewer voltage-gated channels. Unmyelinated axons need voltage-gated channels in along the entire axon.

4) Myelinated axons are more energy efficient than unmyelinated axons. TRUE. The rate at which sodium input through one node can depolarize the axon at the next node is related to the current and capacitance across the membrane. Myelinated axons have faster action potential conduction because it jumps from node to node, thereby they use less energy because they don't have to travel the entire length.

5) Myelinated axons would be unaffected by diseases that attack the CNS. FALSE. For example, Multiple sclerosis (MS) is a demyelinating disease of the CNS in which the immune system attacks the myelin sheath or the cells.

6 0
3 years ago
Which of the following does not have an effect on enzyme activity?
ziro4ka [17]
Shape of active site
8 0
3 years ago
Wha is 3 things countrys need to do to help global warming
Hoochie [10]

Answer:

The measures which is taken by country need to prevent global warming are given below.

1) The government of the country should planted more trees because plants are only organisms which reduces the concentration of harmful gases which causes global warming.

2) Reduce the use of fossil fuels such as petrol, coal and methane gas.

3) Use solar energy instead of fuel for the production of electricity and other industrial products.

4 0
3 years ago
in a vascular plants , specialized root hairs on the roots of the plant are responsible for taking up water and nutrients . The
aksik [14]

xylem tissue is the answer.

5 0
3 years ago
“How fast do hummingbirds fly?” Why is the question a scientific question?
sleet_krkn [62]
Hummingbirds can fly as fast as 60 miles per hour. One reason why its a scientific question is because of their speed. Their speed is very different compared to many other animals. I hope this helps :)
6 0
3 years ago
Read 2 more answers
Other questions:
  • If one year was one foot, how long would the Cretaceous be (65 million) in miles?
    11·1 answer
  • Which two parts make up the lithosphere?
    14·1 answer
  • Ecology involves the study of all of the following except for the interactions between
    8·1 answer
  • When a rehabilitation area is established at the scene of a multiple-casualty incident, it should:?
    6·1 answer
  • how does tobacco smoke effect the body? a.it blocks hemoglobin from binding to oxygen, thus affecting gas exchange in the lungs
    8·1 answer
  • What elements does carbon bond with to make up life’s molecules?
    6·1 answer
  • Cuál es la relación entre el ciclo celular y el material genético?
    10·1 answer
  • Hormones control ____________, the internal balance of body systems.
    7·1 answer
  • Name two models used<br> to show the transfer of<br> energy in an ecosystem
    13·1 answer
  • Glaciers have caused erosion:
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!