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
FromTheMoon [43]
4 years ago
15

The half-life carbon-14 is 5730 years. Archaeologists dig up a seed that contains 0.25 parts per trillion of carbon-14. If it or

iginally contained 1 part per trillion carbon-14, how old is the archaeological specimen?
A) 11,460 years
B) 5730 years
C) 17,190 years
D) 22,920 years
E) 28,650 years
Biology
1 answer:
Sloan [31]4 years ago
3 0

Answer:

A)11,460 years

Explanation:half of a radioactive element represent the time take for half of it's components to dissociate or disintegrate.

For carbonn14 that undergo an emmision to form a stable carbon 14,it moves thus

14C(1 part) ______14C(0.5 parts)_____14C(0.25parts)

i.e it undergo two radioactive decay which means two half lives .

Since each half life is 5780 years ,the age will be 2×half lives= 2×5780=11,460 years

You might be interested in
Cardiac muscle is striated.
fomenos

Answer:

D. because striated muscles can be trained, allowing you to strengthen your heart with exercise

Explanation:

Striated muscles convert chemical energy into physical work. You can make your striated muscles stronger with exercise. This helps the heart perform its function better and more efficiently.

Striated muscle does not have digestive enzymes and does not play a role in digestion. Striated muscles are very strong, and besides, that doesn't show why its beneficial anyway. It is impossible to voluntarily stop your heartbeat. If you did, you'd die.

Therefore, the best answer is D.

hope this helps!

8 0
3 years ago
Genetic Problems A researcher studying petunia plants. These plants have either red or white and this characteristic is influenc
marin [14]

Well, you would use Punnet squares. Don't forget that heterozygous means that the alleles are different so Rr. Homozygous means that the genotype will have the same genes rr. When you put together the Punnet squares, I always like to determine the percentage of phenotypes possible. In this case 50% of them are going to be white, and 50% of them are going to be red.          



4 0
3 years ago
. When biomedical researchers design drugs that must enter cells to be effective, they sometimes add different groups to make th
MrRa [10]

Answer:

1. Non-polar group

2. Increase cholesterol in the phospholipid bilayer

Explanation:

1. The plasma membrane of cells is made up of two layers of phospholipids, this is to insure that there is a distinct separation in the contents of the inside of the cell, from the outside. Water (a polar molecule) cannot easily pass through the membrane, hence a non-polar molecule would pass through easier.

2. Cholesterol in the plasma membrane increases fluidity, hence if the plasma membrane's permeability is decreasing due to the cold temperature, increasing fluidity and permeability would then allow the membrane to retain its function.

3 0
3 years ago
According to biological classification, which of these pairs represents animals that are the most closely related
levacccp [35]
Where are the answer choices
but I think if you have the 
bat, bird and cat and wolf 
it would be cat and wolf
3 0
3 years ago
Which of the following does not cycle quickly!<br> A) Wood<br> B) Oil<br> C) Water<br> D) Carbon
miv72 [106K]

Answer:

I believe it is be

Explanation:

Depending on the type  oil, it can be natural and  non renewable

3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the English name of ''Kagati''? <br> A. Lime <br> B. Lemon<br> C. Mandarian<br> D. Okra
    7·1 answer
  • What would happen to a bacterial cell if its protective covering was destroyed?
    9·1 answer
  • 5. Are all cells within an organism the same? If so, How can they differ?
    12·1 answer
  • What mineral deposit is the reason parts of micronesia have had jungle cover removed?
    13·1 answer
  • I am a human cell with 92 chromosomes. I still have a nuclear membrane. Where am I in the
    15·1 answer
  • The South’s major crops included tobacco, rice, sugar cane and what else
    14·2 answers
  • Select all the kingdoms below that consist of prokaryotes:
    11·2 answers
  • What is a model?
    6·2 answers
  • What problems arose after reintroducing the wolves, and how did the park service attempt to deal with them?
    11·1 answer
  • Tell me an operational definition for each underlined idea. You can do one, but the more you do the more points you get. Thank y
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!