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Anastaziya [24]
3 years ago
5

Mosquitoes can carry and transmit many diseases to humans. In the past, the insecticide DDT was heavily used to reduce mosquito

populations in order to reduce instances of disease transmission. However, after some time, mosquito populations developed a resistance to DDT, which made the DDT less effective in reducing mosquito populations.
Based on what you’ve learned about natural selection, in 3–5 sentences, describe how mosquitoes may have come to develop this resistance.
Biology
2 answers:
Komok [63]3 years ago
5 0
<h2> ☞ANSWER☜</h2>

Human health effects from DDT at low environmental doses are unknown. Following exposure to high doses, human symptoms can include vomiting, tremors or shakiness, and seizures. Laboratory animal studies showed effects on the liver and reproduction. DDT is considered a possible human carcinogen.

DDT-resistant mosquitoes were first detected in India in 1959, and they have increased so rapidly that when a local spray program is begun now, most mosquitoes become resistant in a matter of months rather than years.

DDT is classified as "moderately toxic" by the US National Toxicology Program (NTP) and "moderately hazardous" by WHO, based on the rat oral LD 50 of 113 mg/kg. Indirect exposure is considered relatively non-toxic for humans.

Mass spraying of DDT led mosquitoes to develop resistance. Nor has there been much incentive for companies to develop new mosquito-killing insecticides, which could be used in tandem with existing ones to slow the development of resistance

lara [203]3 years ago
3 0

Answer:

Evolution takes place every generation of a species. The more rapid a species procreates the quicker it can respond to percieved threats & challenges in its environment. This is why insects, rodents, bacteria, and viruses can more readily adapt to chemical sprays or agents that are used to kill it. Mosquitos and DDT are such prime example of adaptation; mosquitos that survived DDT became more immune to its effects through genetic changes for each generation exposed.

Explanation:

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Answer:

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7 0
3 years ago
According to FDA labeling, which product could be considered “fresh”?
Westkost [7]

The correct answer should be grapes... you know "freshly plucked from the vines just now".

6 0
3 years ago
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Why does a vegetarian leave a smaller ecological footprint than an omnivore? (A) Fewer animals are slaughtered for human consump
Anarel [89]

A vegetarian leaves a smaller ecological footprint than an omnivore because Eating meat is an inefficient way of acquiring photosynthetic productivity.

<h3>What is an omnivore?</h3>

Omnivores are creatures that can devour and survive on both plant and animal matter. The minerals and energy from the sources consumed are digested by omnivores, who derive their energy and nourishment from both plant and animal matter. They typically possess the ability to consume food sources like bacteria, fungi, and algae. Omnivores are diverse in their origins and frequently have complex eating habits that they independently acquired. The great variety of different organisms that are classified as omnivores can be grouped into numerous subcategories based on their feeding patterns.

To learn more about omnivore with the help of given link:

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6 0
2 years ago
Look at the following statement. What one word completes the second gap? Substances move by active transport from an area where
Effectus [21]

Answer:

The question is not well structured, the correct one is;

Look at the following statement. What word completes the second gap? Substances move by active transport from an area where they are __________ concentrated to an area where they are __________ concentrated

The answer is MORE

Explanation:

Substances move from one position to another in living systems. This movement of substances can either be passive (without energy) or active (require energy). Active transport of substances involves the movement of substances against their concentration gradient.

Ideally, substances move naturally from an area they are more concentrated to an area they are less concentrated but in active transport, the opposite occurs i.e. substances move from area that they are less concentrated to one that they are more concentrated, which is going up against the normal concentration slope/gradient. Due to this, energy in form of ATP is usually required by the cell to perform active transport unlike passive transport that occurs without energy input.

Exanples of active transport in living cells are exocytosis and endocytosis in some organisms. Based on this explanation, the first gap will be LESS while the second gap will be MORE.

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4 years ago
Which situation is an example of competition that would be found in the grassland?
Rina8888 [55]
When two lions compete for the same habitat, shelter, and food
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