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Marat540 [252]
4 years ago
14

When first used in medicine in the 1940s, penicillin was uniformly effective in killing the bacterium Staphylococcus aureus. Tod

ay, ____________________ has led to an increase in antibiotic-resistant alleles, and humans are increasingly at risk from untreatable Staphylococcus aureus infections
Biology
1 answer:
adelina 88 [10]4 years ago
5 0

Answer:

The correct answer is "natural selection in Staphylococcus aureus populations".

Explanation:

Natural selection is a process at which populations of organisms develop advantageous traits under the premise of survival of the fittest. In this case, the continuous exposure to penicillin and other antibiotics since 1940s have a natural selection effect in Staphylococcus aureus populations, allowing an increase in antibiotic-resistant alleles in the bacteria, which acts as an advantageous trait for them. Antibiotic resistance is a serious medical concern that has been addressed by a culture of responsible use of antibiotics and development of novel treatments for infections.

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Jonathan used the following soil triangle to identify a sample of soil as sandy clay.
sineoko [7]

The description of soil according to Jonathan is as follows:

  • Mostly large grains, with a gritty texture, 45% sand, 5% clay, and 45% silt ---- Silty loam soil.
  • Mostly large grains, with a sticky texture, 55% sand, 40% clay, and 5% silt ----- Sandy clay soil.
  • Mostly small grains, with a sticky texture, 30% sand, 50% clay, and 20% silt ----- Clay soil.
  • Mostly small grains, with a smooth texture, 30% sand, 5% clay, and 65% silt ----- Silty loam soil.

<h3>What is Soil Texture?</h3>

Soil texture may be defined as a classification of soil on the basis of its physical appearance, texture, and properties.

In this question, the texture and composition of other soil are illustrated briefly with respect to each common soil type.

Therefore, it is well described above.

To learn more about Soil texture, refer to the link:

brainly.com/question/946875

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6 0
2 years ago
Which of these events occurs during metaphase? chromosomes coil and condense centromeres separate chromosomes migrate to equator
zheka24 [161]
The chromosomes migrate to the equator of the spindle apparatus, they line up in the middle. meta means middle
4 0
3 years ago
How long does your cerebrum take to fully develop?
crimeas [40]

Answer:

about nine mouths hope this helps

Explanation:

5 0
3 years ago
What is the central Nervous system (cns)​
Allisa [31]

Answer:

the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.

Explanation:

^

4 0
3 years ago
A mutation in a gene results in an animal that cannot make a protein that allows muscles to contract which of these is most like
san4es73 [151]

Answer:

it will get weaker give water

Explanation:

feed it bread

7 0
3 years ago
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