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Allisa [31]
3 years ago
8

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 cataracts, how do they occur, and how are they treated?

a. A cataract is a clouding of the lens. Some cataracts are congenital, but most are due to age-related hardening and thickening of the lens, diabetes mellitus, or exposure to UV rays over time. The lens can be removed and replaced
with an artificial lens.
b. A cataract is a clouding of the cornea. Some cataracts are congenital, but most are due to age-related hardening and thickening of the lens, diabetes mellitus, or exposure to UV rays over time. A corneal transplant can be performed to replace the damaged cornea.
c. A cataract is increased intraocular pressure. This occurs when drainage of the aqueous humor is blocked. They are treated with eyedrops that increase the rate of aqueous humor drainage or decrease its production.
d. A cataract occurs when there are unequal curvatures in different parts of the cornea or lens. This is a congenital condition. Specially ground lenses or laser surgical procedures are used to correct this problem.
Biology
1 answer:
yan [13]3 years ago
7 0

Answer:a. A cataract is a clouding of the lens. Some cataracts are congenital, but most are due to age-related hardening and thickening of the lens, diabetes mellitus, or exposure to UV rays over time. The lens can be removed and replaced

with an artificial lens.

Explanation:

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Explain this question plz!
lesya692 [45]

Answer:

1/2

Explanation:

Ggrr gives Gr, Gr, gr, gr

ggRR gives gR only.

So, the combination would be <u>GrRr</u>, <u>GrRr</u>, ggRr, ggRr

To have both dominant traits, the child has to GG or Gr, and RR or Rr

2/4=1/2

3 0
4 years ago
Which organisms convert nitrogen into a form that is usable by<br> humans
ycow [4]

there are two or three types or methods in which they change according to the class you study so this a answer from a 8th grader ( there are difference in classes)

<u>Nitriates</u> are a form of <u>nitrogen</u> that is usable by plants.

It is assimilated into plant tissue as protein. The nitrogen is passed through the food chain by animals that consume the plants, and then released into the soil by decomposer bacteria when they die.

Nitrification is the conversion of ammonia (NH3) to nitrate (NO3). It is usually performed by soil living bacteria, such as nitrobacter. This is important because plants can assimilate nitrate into their tissues, and they rely on bacteria to convert it from ammonia to a usable form.

denitrifying bacteria convert nitrogen into ammonia which is a form of nitrogen that is useful to humans. Bacteria "fixes" gaseous nitrogen into nitrogen usable by plants in the form of nitrate.

6 0
3 years ago
Different warbler species share the same food source. They have adapted by living in different areas of trees to reduce competit
Iteru [2.4K]

Answer;

-Coevolution;

Explanation;

-Coevolution is a change in one species that results from a change in another species that it interacts with. Coevolution occurs when two or more species reciprocally affect each other's evolution. Example; Different warbler species share the same food source. They have adapted by living in different areas of trees to reduce competition.

-Coevolution is common among organisms participating in a mutual interaction. In mutualism, both the organisms benefit from each other. When coevolution occurs among mutually benefiting species, it is called mutualistic coevolution.

4 0
3 years ago
Read 2 more answers
During DNA replication each strand of dna is used as a template to produce a complementary strand of DNA This process is shown b
Greeley [361]
I think the answer might be adenine?
4 0
3 years ago
A communications satellite transmits a radio wave at a frequency of 9.4 x 10^9 Hz. What is the signal’s wavelength? Assume the w
sergejj [24]
To calculate this we will use the light equation:
c=λ*f

We have Frequency f=9.4* 10^{9}Hz.
We know that speed of light in vacuum is c =3.8* 10^{8} m/s.
Since a unit of speed of light is m/s, we can change the unit of frequency Hz to 1/s, since Hz means cycles per second (f=1/T).

So:
f=9.4* 10^{9}1/s
<span>c =3.8* 10^{8} m/s
</span>
<span>c=λ*f
</span>⇒ λ= \frac{c}{f}
⇒ λ= \frac{3.8* 10^{8}}{9.4* 10^{9}}
⇒ <span>λ</span>=0.04 m

5 0
4 years ago
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