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laila [671]
3 years ago
8

When they were first sold, certain insecticides were highly effective in killing mosquitoes. Today, dozens of mosquito generatio

ns later, a much smaller proportion of these insects die when sprayed with the same chemicals. Fewer insects are killed today because _____.
A. mosquitoes are deliberately adapting themselves to this man-made change in the environment
B. mosquitoes that survive spraying develop an immunity to the insecticide
C. many mosquitoes today are descendants of mosquitoes with insecticide-resistant characteristics
D. the original spraying has caused a permanent mutation, giving the insects genetic resistance to the spray
Biology
1 answer:
zvonat [6]3 years ago
3 0

Answer:

C. many mosquitoes today are descendants of mosquitoes with insecticide-resistant characteristics

Explanation:

When insecticides were first sold, they where highly effective in killing mosquitoes but few mosquitoes will definitely survived. If these mosquitoes that survived mate together, they  will produce hybrid offspring that possess characteristics that are  insecticide-resistant. The more  insecticide-resistant mosquitoes that breed together in subsequent generations, the more permanent mutant hybrid offspring will be produced which will eventually make them to become resistant to the use of insecticides over them.

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Which stage represents the climax community
castortr0y [4]

Explanation:

climax community refers to a stable ecosystem in its final stage of ecological succession. Succession is when one community of plants and animals replaces another in an ecosystem. In a climax community, the plants and animals are in balance with each other and their environment.

8 0
2 years ago
Neural control of gfr is mediated by ________ that innervate ________ receptors on vascular smooth muscle causing ________
storchak [24]

Neural control of GFR is mediated by Sympathetic neurons that innervate alpha receptors on vascular smooth muscle causing Vasoconstriction.

<h3>How is GFR regulated?</h3>
  • The sympathetic division of the nervous system regulates the GFR or Glomerular Filtration Rate.
  • GFR is the sum total of filtration rates of all the working nephrons in the kidney.
  • Sympathetic division comes into action when the mean arterial pressure is very low (below 80mmHg).
  • In response to low blood pressure, the medulla releases norepinephrine through sympathetic nerves.
  • Norepinephrine leads to activation of alpha receptors on arteries which cause vasoconstriction.
  • Alpha receptors are more abundant on afferent arterioles.
  • This leads to vasoconstriction (narrowing) of arteries supplying to the glomerulus.
  • This decreases blood flow to glomerulus, leading to decrease in GFR.

Learn more about Glomerular Filtration Rate here:

brainly.com/question/13064727

#SPJ4

8 0
2 years ago
completeaza un tabel cu nume de plante de cultura ale caror seminte contin leucoplaste cu amidon, cu grasimi, si cu proteine
Komok [63]

Answer:

pulses and legumes seeds.

Explanation:

Pulses and legumes seeds such as chickpea and mung bean are those seeds which contains starch, fat, protein and leucoplasts. Leucoplasts are present in pulses seeds which is responsible for the storage of starch, lipids, and proteins in the seed. So with the presence of leucoplasts in the seeds, starch, fat and protein stored inside the pulses and legumes.

6 0
3 years ago
A biologist analyzes the DNA sequences of one gene in three different primates . The biologist finds that primates A and B have
Nataly_w [17]

The question is incomplete as it does not have the option which are:

  • primates A and B are more closely related to each other than either is to primate C.
  • all three primates appeared on Earth at about the same time.
  • either primate A or primate B must be a direct ancestor of primate C.
  • primate C must have been the ancestor of both primate A and primate B.

Answer:

Primates A and B are more closely related to each other than either is to primate C.

Explanation:

In the given question, on the basis of the given information, it can be predicted that the Primate A and B are more closely related to C as the DNA sequences of these two primates are almost similar. The similarity of the sequence suggests that these primates have descended or diverged from a common ancestor.

The DNA sequence of C is different from both A and B which shows that both A and B are different from the C.

Thus, the selected option is the correct answer.

5 0
3 years ago
Read 2 more answers
During asexual reproduction in paramecia, a single paramecium becomes two new
nydimaria [60]

Answer:

Similar too the original

Explanation:

8 0
3 years ago
Read 2 more answers
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