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
Allushta [10]
4 years ago
11

How did insects become resistant to DDT

Biology
2 answers:
Galina-37 [17]4 years ago
3 0

Answer:

A. Some were already resistant and were the survivors that could reproduce

Explanation:

Both resistant and susceptible insects will be exposed to DDT, but according to the evolution theory, it is expected that those insects that are resistant to the insecticide will be selected by natural selection. In consequence, the resistant individuals will survive to reproduce in the next generation.  

Snowcat [4.5K]4 years ago
3 0

Answer:

A.Some were already resistant and were the survivors that could reproduce

Explanation:

Insects are known for their ability to develop resistance to insecticides. Currently there are insects resistant to every synthetic chemical insecticide used. There are many factors to developing resistance. In a population of insects there may be a few individuals that carry the genes for resistance. These genes arise from genetic mutations that are rare.  Upon exposure to insecticides, insects that do not carry the resistance genes die, thus allowing the individuals with the resistance genes to survive and reproduce, creating more resistant insects. With every generation the number of resistant insects increase.

You might be interested in
What traits do all organisms with no internal thermoregulation have
joja [24]
Ectotherms have to be heated or cooled by the environment 
5 0
3 years ago
Read 2 more answers
What is c6h12o6 + h2o
MatroZZZ [7]
In order to balance the combustion reaction C6H12O6 + O2 = CO2 + H2O you'll need to watch out for two things. First, be sure to count all of C, H, and O atoms on each side of the chemical equation. ... Be careful when counting the Oxygen atoms on the product side of the equation hope this help
3 0
3 years ago
Read 2 more answers
List some things you can do to eliminate deforestation (cutting down forests)​
Alex

Answer:

1.Plant a tree.

2.Use less paper.

3.Recycle paper and cardboard.

4.Use recycled products.

5.Buy only sustainable wood products.

6.Don't buy products containing palm oil.

7.Reduce meat consumption.

8.Do not burn firewood excessively.

Explanation:

Hope this helps :)

7 0
3 years ago
Is the skin on the back of my hand living or nonliving?
mojhsa [17]

The correct answer is non-living.

The outermost layer of the epidermis comprises 25 to 30 layers of dead cells. The stratum corneum is the outermost layer of the epidermis, comprising of dead cell, that is, corneocytes. This layer comprises 15 to 20 layers of flattened cells with no cell organelles and nuclei, their cytoplasm exhibits filamentous keratin.


7 0
4 years ago
You step on a sharp rock, your leg goes upward and a moment later you feel pain in your foot. Use the words motor neuron, sensor
tatuchka [14]
When you step on a sharp rock, your<span> leg</span> goes<span> upward and just a moment later you feel pain in your foot. The fact that your leg goes upward is caused by automatic reflex actions by neuron combinations called reflex arcs. Stepping on a sharp rock for example, a sensory neuron </span><span>transports an impulse to an </span><span>interneuron in the spinal cord. The interneuron come together with motor neurons that pull your foot away from the sharp </span>object. The<span> interneuron also come together with motor neurons that control the muscle </span>leg. The muscle legs adjust your position so you don not fall over. The interneuron come together with the other neurons so that you become conscious about what just happened and can take some actions.<span> </span>
7 0
3 years ago
Other questions:
  • You are carefully examining a living organism. Which of the following should convince you that the organism is acoelomate?
    6·1 answer
  • List the ways in where tadpoles and frogs differ from each other
    15·2 answers
  • How do sponges breath
    7·1 answer
  • Adequate food safety practices lead to less: A:Food waste B:Insurance costs C:Hospitalizations D:Training
    13·2 answers
  • Why do cells with the same DNA have different functions?
    6·1 answer
  • Who can help with those problems anybody
    5·1 answer
  • Line t passes through (4, 5) and is perpendicular to the line shown on the coordinate grid.
    9·1 answer
  • A scientist study in the evolutionary relationships among each species of bears the scientist constructed the following diagram
    10·2 answers
  • If a molecule is composed of several amino acids what kind of biomolecule is it
    13·2 answers
  • Chipmunks use cheek pouches to carry food and store for the winter. Is this a structural adaptation, behavioral adaptation, or b
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!