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
bekas [8.4K]
3 years ago
7

If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years?

Biology
2 answers:
umka21 [38]3 years ago
7 0

The answer is C. 20 grams.

gavmur [86]3 years ago
6 0
20 is your answer
hope this helps
You might be interested in
Which of the following is NOT a natural resource?
Shalnov [3]

Answer:

D

Explanation:

Fire is man made because for there to be fire you have to strike a match or use other man made sources

4 0
3 years ago
What is the most abundant element in the earth's atmosphere?
iogann1982 [59]
Nitrogen,<span>The atmosphere is composed of ~78% nitrogen and ~21% oxygen, with small amounts of other gases. The bulk composition of the earth by weight is mostly, iron, oxygen, silicon and magnesium, in that order, with all the other elements making up only about 5% of the earth's weight.</span>
8 0
3 years ago
An example of a single-gene trait is
Tamiku [17]
Hairline: either straight or widow's peak
7 0
3 years ago
Which statements can be made about mass and weight? Check all that apply.
dem82 [27]

Answer: Weight can be measured in pounds.

Explanation:

7 0
3 years ago
The
worty [1.4K]
A anitcodons .......
5 0
3 years ago
Other questions:
  • A stamen consists of _____.stigma and filament;stigma and style;ovary and sepal;anther and filament;stigma and anther;
    10·2 answers
  • Body parts that work in pairs to help your body parts move
    15·2 answers
  • Do greenhouse gases cause the earth to warm up, or does the earth warming up cause greenhouse gases?
    13·1 answer
  • A fern dies and is buried beneath many layers of mud, sand, and/or soil. Many years pass, and the mud, sand, and/or soil harden
    5·2 answers
  • The area of biology devoted to the study of fungi is known as?
    14·1 answer
  • Explain how heat can be a source of water pollution.
    5·2 answers
  • What traits do you think mice have to help them escape from owls
    6·1 answer
  • Which piece of data helps explain the uneven distribution of minerals across earth's crust
    15·2 answers
  • 20 POINTS!<br> Its for a test!<br> Answer quick please
    12·2 answers
  • Chlorophyll, the primary photosynthetic pigment, emits light in the red region of the visible spectrum. The presence of chloroph
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!