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
Lunna [17]
3 years ago
15

After three half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to star

t?
Biology
2 answers:
ollegr [7]3 years ago
7 0

The answer is actually (80). 80/2 is 40, 40/2 is 20, and 20/2 is 10, thus the answer is 80.

GarryVolchara [31]3 years ago
4 0
I think that the answer is 40...................................
You might be interested in
What other system must work with muscles and how do the two systems work together
Ivan
<span>  music works with skeletal system, the nervous system and the circulatory system</span>
3 0
3 years ago
17. Which of the following examples of an ecological effect leading to an evolutionary effect is most correct? A) When seeds are
dusya [7]

Answer:

The correct option is C.

Explanation:

Evolution refers to the gradual development of living organisms from earlier forms to the forms that exist today. One of the principal factors that lead to evolution is the ability of an organism to adapt to adverse changes in its environment. Organisms that are able to survive adverse changes in their environments usually go on to produce offspring that possess their parents' ability to survive.  A good example of this is given in option C, where individuals with denser fur were able to survive from severe cold and then give birth to young ones that inherit their parents' ability to survive severe cold.

5 0
3 years ago
Which is not a physical change in the digestive system?
bulgar [2K]

Answer:

C

Explanation:

it is chemical, not physical

6 0
2 years ago
Complete the sentence with the correct answer. During World War II, the tide turned in favor of the United States at the Battle
MrRissso [65]
<span>A. Leyte Gulf.

Upon the return of the Americans in the Philippines, the Battle on the Leyte Gulf emerged as one of the largest naval battles in history wherein the Americans are victorious against Japan.

</span>
3 0
2 years ago
Biology students at Science High spent the day swabbing surfaces throughout the school. They ran the swabs over a culture plate
pantera1 [17]

ANSWER; C                          carol and Jose's  plate  contains streptococcus bacteria that could be potential dangerous for humans.                                                                                                                              

5 0
2 years ago
Other questions:
  • In the text area below describe the function of the cell wall
    6·2 answers
  • Which are examples of convention currents
    10·1 answer
  • The presence of dimples in the cheeks, and the presence of freckles are both dominant traits in humans. A woman who has no dimpl
    15·1 answer
  • Which of the following is not a nutrient needed by the body?
    14·1 answer
  • A homozygous red flower is crossed with a homozygous white-flowered what are the expected phenotypes of The offspring
    7·1 answer
  • 6.
    12·2 answers
  • True or False: The greater the charges
    15·1 answer
  • Cual es la forma de reproducción de protozoo plasmodium
    9·1 answer
  • Which change is chemical?
    12·1 answer
  • The body has a number of systems that protect against infection.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!