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
lilavasa [31]
3 years ago
5

if an element has a half-life of 30 million years and there is 12.5% of it remaining in a rock, how old is that rock

Biology
1 answer:
Assoli18 [71]3 years ago
3 0

Answer:

The half-life of a substance is the amount of time it takes for half of that substance to decay. However, after two half-lives, half of the half remaining will decay, leaving you with one quarter of the original substance.

So, after 1 million years you will have 50% of the original substance remaining.

And, after 2 million years you will have 25% of the original substance remaining.

After 3 million years you will have 12.5% of the original substance remaining.

And after 4 million years you will have 6.25% of the original substance remaining.

Explanation:

Hope it helps:)

You might be interested in
How does light travel?
ELEN [110]
D, light can travel in the air or a vacuum and the speed is constant whether the light source is stationary or moving.
3 0
2 years ago
Read 2 more answers
What are the 3 most important energy-carrier molecules in a cell? What are their overall jobs?
Simora [160]

Answer:

<em>Three important energy carrier molecules in a cell are: ATP (Adenosine triphosphate, NADPH (Nicotinamide Adenosine Dinucleotide Phosphate) and FADH2. </em>

Explanation:

All the three carrier molecules play an important role in cellular respiration and photosynthesis. One NADH molecule is equal to 3 ATP molecule while 1 FADH2 molecule is equal to 2 ATP molecule.

During the active process, ATP is used as a form of energy because ATP dephosphorylates to ADP and Inorganic phosphate, Pi and release energy.

3 0
3 years ago
Γ<br> How many colonies are there?
Natalka [10]
There are 13 colonies
4 0
3 years ago
The gi organ that is the major site of nutrient absorption is the ________.
Novay_Z [31]
The answer to this would be a SMALL INTESTINE. The small intestine is the major site for the absorption of nutrients. Nutrients include different vitamins and minerals that are extracted from the foods that we eat. How absorption is possible in this site is the presence of e<span>pithelial cells of the villi. Hope this helps.</span>
5 0
3 years ago
Identify the fungus type pictured below.
MatroZZZ [7]
That would be ascomycota or sac fungi. Sac fungi are characteristically known for producing ascus. This is a sac-like structure that contains haploid spores called ascospores. Some examples of sac fungi are yeast, truffles, morels and dead man's fingers. 
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which has very high population density
    11·1 answer
  • Which region of the operon does the repressor bind to?
    10·2 answers
  • Even a jumperless motherboard is likely to have one jumper. which jumper is it
    12·1 answer
  • 1)Water is said to have a high boiling point. How does this property of water allow for life in the oceans?
    6·2 answers
  • Shelby performed an investigation in which she monitored her heart rate while she ran on a treadmill. She used a heart rate moni
    14·1 answer
  • Those factors that are kept the same in the experimental group and the control group are called:
    15·1 answer
  • Which of the following groups of people would be the least affected by air pollution?
    14·2 answers
  • if a specimen takes up one quarter of the field of view (0.500 mm), what is the size of the specimen in micrometers (um)?
    5·2 answers
  • Consequences of hiv on individual and community
    12·2 answers
  • 3
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!