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
jeka57 [31]
2 years ago
9

3. If a rock was determined to be around 3.9 billion years old how much Potassium 40 would be left in that rock sample?

Biology
1 answer:
son4ous [18]2 years ago
5 0

Answer:

What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.

]

Explanation:

You might be interested in
Why do planets close to the sun have thin atmospheres and the planets far away from the sun have thick atmospheres. Use what you
den301095 [7]

Answer:

There are two primary factors: size and distance from the Sun. Gravity helps planets and moons to hold on to their atmospheres, so small planets/moons such as Mars and the Moon have thin atmospheres. The reason why the outer planets are larger is probably down to two major factors. The first is simply the amount of material available which may be accreted to a planet. Clearly, the further away from the Sun, the longer the orbit (twice as far means an orbit twice the physical length).

Explanation:

4 0
3 years ago
A mediastinal shift occurs in which type of chest disorder? tension pneumothorax simple pneumothorax cardiac tamponade traumatic
OleMash [197]

Mediastinal shift occurs in Tension pneumothorax.  A tension pneumothorax makes the lung to collapse and the heart, the trachea and  the great vessels,  to shift toward the unaffected side of the chest. When air moves out from a laceration in the lung and goes in the pleural space or infiltrate the pleural space over a wound in the chest wall the shift happens. 
5 0
3 years ago
A student is studying a process in which a diploid cell becomes haploid. Which of these shows the CORRECT mathematical model for
fredd [130]
The correct answer is this one: "C) Nnew = Nold + 2." A student is studying a process in which a diploid cell becomes haploid. The CORRECT mathematical model for the process if Nnew is the number of chromosomes in the haploid cell and Nold is the number of chromosomes in the diploid cell is this: <span>new = Nold + 2
</span>
Here are the choices.

<span>A) Nnew = 2·Nold
B) Nnew = Nold 2
C) Nnew = Nold + 2
D) Nnew = Nold × 2</span>
7 0
2 years ago
“A mound of coal sitting in a field ____."
frosja888 [35]

Answer:is storing potential energy

Explanation:

4 0
3 years ago
Which best describes biogeographic isolation?
Ganezh [65]

The correct answer fro above statement is:

<h3>D. It occurs only through geographic forces.</h3><h3>Explanation:</h3>

Biogeographic isolation can be defined as the division of members of the same species through geographical or biological forces.The group comprises species of animals that can grow and can create offspring that are also competent of breeding.

3 0
2 years ago
Read 2 more answers
Other questions:
  • 10. Which of the following statements best describes the major difference between anaphase of mitosis and anaphase I of meiosis?
    6·1 answer
  • Which of the following led to the discovery of cells?
    10·1 answer
  • The reduction of the chromosome number during meiosis is most important for__?
    13·1 answer
  • Which energy sources could provide energy to run an electric vacuum cleaner or power the lights in a football stadium?
    12·1 answer
  • What causes the change from day to night and vice versa?
    11·2 answers
  • How did the backyard bird feeders in the article increase competition in that ecosystem?
    14·1 answer
  • When you look at the night sky, sometimes there is a full moon and sometimes the moon looks like it’s barely there. Why does thi
    11·1 answer
  • Hi please please help<br>​
    8·1 answer
  • Explain why you cannot assume that if a couple has four children, each child will represent a different box within the Punnett s
    15·1 answer
  • Harold’s wonders how much of a role genetics plays in determining his weight. He has heard about a gene, called leptin. Mice wit
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!