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ehidna [41]
4 years ago
13

Ling, a 75-year-old grandmother, complained that her vision was becoming obscured. upon examination by an ophthalmologist she wa

s told she had cataracts. what are they, how do they occur, and how are they treated?
Biology
1 answer:
svetoff [14.1K]4 years ago
6 0
<span>A cataract is simply the clouding on the lens of the eye that makes it a little more difficult to see, causing some distortion as if looking though a fogged window. Some of these are congenital but generally they are age related due to the lens hardening an thickening as well as a side effect of diabetes. It is likely caused by inadequate delivery of nutrients to the deep lens fibers. Smoking and frequent exposure to intense sunlight increase ones risk for cataracts, but long term vitamin c supplements can help decrease the risk. In order to treat this condition, the lens can be removed and then replaced with an artificial lens.</span>
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Refer to the paragraph about the formation of the isthmus of panama. the sister populations on opposite sides of the isthmus are
Dimas [21]
The answer is reproductive isolation. Reproductive isolation ensures members of different species do not produce offspring. In this case, geographical separation is ensuring that individuals from the two different populations are not able to mate with each other. Eventually, through different selective pressures, the two populations will diverge sufficiently in genotype to become distinctly different.
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3 years ago
A force that slows down airplanes
Semmy [17]
Drag Force or Turbulence
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3 years ago
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How does shared characteristics help scientists determine evolutionary relationships?
abruzzese [7]

Answer:

A shared character is one that two lineages have in common. Because organisms evolve from common ancestors and then diversify, the logic is stating that the more shared characteristics two organisms have, the closer their evolutionary relationship is.

Explanation:

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3 years ago
Give at least three facts autotrophs and heterotrophs on earth are true?
White raven [17]

Answer:

  • Autotrophs are usually defined as those that can prepare their own food by carrying out the process of photosynthesis, but heterotrophs cannot prepare their own food and are directly dependent on the autotrophs for food. Examples of autotrophs are plants and trees, and examples of heterotrophs are animals and human beings.
  • Autotrophs are the lowest organisms in the trophic level, where they produce the food for the consumers (heterotrophs). On the other hand, the heterotrophs lie above the autotrophs and when they consume their food, they obtain only 10% of the energy, and the remaining energy is released into the environment.
  • Autotrophs can make organic substances by the use of inorganic molecules, but heterotrophs cannot make these substances. They are only dependent on the molecules prepared by these autotrophs.

Thus, these are three of the facts regarding autotrophs and heterotrophs existing on earth that are true.

4 0
3 years ago
Need help with this assignment
Rashid [163]

To locate <u>positions</u> in east and west directions, <u>cartographers</u> use lines of <u>longitude</u>, also known as <u>meridians</u>. Longitude is the distance in degrees <u>east</u> or <u>west</u> of the prime meridian, which is the reference point for longitude.

<h3>What is a topographic map?</h3>

A topographic map can be defined as a type of map which contains an accurate and detailed graphical (two-dimensional) description, representation or records of both natural and man-made (artificial) features on the surface of planet Earth.

Generally, a topographic map make use of contour lines to represent points of equal elevation above sea level such as:

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<h3>What is a line of longitude?</h3>

A line of longitude can be defined as an imaginary great circle of constant longitude on the surface of planet Earth which passes through the North pole (terrestrial pole) and South poles (Meridian) at right angles to the equator.

Read more on line of longitude here: brainly.com/question/17355844

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2 years ago
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