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
taurus [48]
4 years ago
8

Mosquitoes in tropical regions can carry and transmit the malaria parasite to humans. The mosquitoes used to be killed in these

regions by spraying them with the insecticide DDT. The mosquitoes that were earlier sensitive to DDT are now not killed by DDT and grow and multiply even in the presence of DDT. How can you explain this phenomenon?
Select one of the options below as your answer:


A.
All of the mosquitoes must have undergone a mutation for DDT resistance and produced similar kind of resistant offspring, which evolved into a DDT resistant population.


B.
Some of the
mosquitoes must have undergone a mutation for DDT resistance and produced similar kind of resistant offspring, which would have been selected by nature.


C.
All of the mosquitoes must have slowly increased their tolerance level to DDT and ultimately would have become completely resistant to DDT.
Health
2 answers:
ASHA 777 [7]4 years ago
4 0

I think it would be c.


I hope this helps good luck! :)

DIA [1.3K]4 years ago
3 0
Right answer is iption b.hopefully it helps.
You might be interested in
Choose one movement where your lower body needs the muscle groups of your legs to work together and explain their part in the mo
Airida [17]
Squatting is a compound exercise that works almost every part of your lower body, but especially your quads.
6 0
3 years ago
The single most important risk for skin cancer is _
Sveta_85 [38]

Answer:

The single most important risk factor for skin cancer is overexposure to UV radiation which may be natural such as sunlight

Explanation:

7 0
4 years ago
Read 2 more answers
When will moderna boosters be available for 65 and older
Ksenya-84 [330]

Answer:

this is what i found

Explanation:

Currently, the boosters are only available for those with compromised immune systems. But additional authorization could come by the end of the week. A panel of U.S. health advisers unanimously recommended a half-dose booster of the similar Moderna vaccine for certain groups last week

8 0
3 years ago
In the early years of microbiology, scientists often removed disease material from one patient and introduced it into other indi
Helga [31]
According to Koch's postulates, the major flaw in their experimental process was that t<span>hey didn't isolate pure cultures of the suspected infectious agent. 
This is the reason why they couldn't determine the cause of the disease in the first patient, given that they didn't fully conduct the experiment. Had they done everything according to Koch's postulates, they would have understood this in terms of microbiology much better.

</span>
6 0
3 years ago
Whether a person needs a sports drink during exercise depends on
ExtremeBDS [4]
Whether a person needs a sports drink during an exercise depends on a variety of factors, including where their blood glucose levels were at before beginning exercise, whether or not they have a condition such as diabetes, how long they are exercising and how much effort they are putting into their exercise.
<span />
7 0
4 years ago
Other questions:
  • Your teacher returns a paper that shows a grade of "D" instead of the "B" you expected. When you see the grade, which stage of s
    12·2 answers
  • A balanced relationship between the energy that you intake and your body’s energy output is the definition of _____.
    12·2 answers
  • In order to prevent backup of sewage waste in a culinary sink, which of the following must be installed?
    14·2 answers
  • According to Maslow's heirarchy of needs, explain what needs must be met in order for a person to reach self-actualization.
    7·2 answers
  • A patient named Roberto is grieving because he noticed that the money he has saved all his life is not going to his family but i
    8·1 answer
  • Discuss one autoimmune disorder that affects each of the respiratory, nervous, sensory, and lymphatic systems. Include a descrip
    6·1 answer
  • Weakness of this structure is one of the causes of gastroesophageal reflux disease
    15·1 answer
  • When he came to, his vision was blurred, and he was slurring his speech. Which facility should he visit to treat his injuries
    5·1 answer
  • Your helmet should fit low and snug on your head<br><br> True or False?
    15·2 answers
  • What are the ten horseshoe rules?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!