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
yawa3891 [41]
3 years ago
6

If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 g

rams C. 20 grams D. 30 grams
Biology
2 answers:
satela [25.4K]3 years ago
8 0

Answer:

c. 20

Explanation:

tatiyna3 years ago
6 0
60 years is three half life for the substance, so 40*1/2^3=5
You might be interested in
Sand is made of different types of rocks shapes and sizes of rocks are not all the same sand is a ?
Anit [1.1K]

Answer:

<h3>sand is a substance: because is a mixture of two or more material which are not completely comband tougher but are phsicla comband tougher</h3>
8 0
3 years ago
Question 10
lesantik [10]
Cognitive psychology. Anything that has the word “thinking” or “perception” will be cognitive.
8 0
3 years ago
HELP ASAP!!!
Kitty [74]
<span>C. Several billion,,,,,,,,,,,,,,,,,,,,,</span>
8 0
3 years ago
Read 2 more answers
Please help!!!!!!!!!!!!!
snow_lady [41]

Answer:

A

Explanation:

The answer is A because they get their genetics from both parents, not just one

6 0
2 years ago
Read 2 more answers
There are hundreds of different restriction enzymes that each cut ______ at a different palindrome sequence.
Sphinxa [80]

Answer:

DNA

Explanation:

<h2>What is DNA?</h2>

DNA is a self-replicating material that is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.

4 0
2 years ago
Other questions:
  • Using the diagram above, which layer is the densest?
    9·1 answer
  • What's the relationship between antigens and antibodies
    9·1 answer
  • What is the best definition of directional selection
    12·2 answers
  • What is the fertilization process for a salmon?
    6·1 answer
  • A car traveling at 15 m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. what is its acceleration ?
    12·1 answer
  • The body is supplied with oxygen by the _____.
    11·1 answer
  • Approximately 75% of all breast cancers grow in response to
    7·1 answer
  • Beans may be tall or short depending on one locus, and they may have long or stubby pods, depending on another locus. A tall, st
    14·1 answer
  • А
    15·1 answer
  • A major disturbance that the ecosystem was able to recover completely from. ____________________________________________________
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!