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Nikolay [14]
3 years ago
13

A clear object inside the eye that focuses light on the retina

Biology
2 answers:
topjm [15]3 years ago
8 0
The lens is transparent, flexible its located behind the iris and the pupil its the second part of your eye after the cornea
Pachacha [2.7K]3 years ago
7 0
The answer you need is the LENS, it helps your eyes focus. i really hope this helps!

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A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?
yan [13]

Answer:

t_{\frac{1}{2}} = 101.16 minutes

Explanation:

For a First order reaction, the rate constant is determined by

k = \frac{2.303}{t} log \frac{a}{a-x}

Where

k= rate constant

t= time required for a reaction

a= initial concentration

x= amount of reactant decomposed in time t

a-x= amount of reactant left after time t

Let the initial concentration be 100

Then

x = 25\\a-x = 75

Substituting the given values in above equation, we get -

k = \frac{2.303}{42} log \frac{100}{75} \\

k = 6.85 *10^{-3}

Also,

k = \frac{0.693}{t_{\frac{1}{2}} } \\t_{\frac{1}{2}} = \frac{0.693}{6.85 *10^{-3}}\\

t_{\frac{1}{2}} = 101.16 minutes

Read more on Brainly.in - https://brainly.in/question/6804668#readmore

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Which of these terms describes both carbohydrates and protein?
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Of the different sources of genetic variability, which one causes the variation in the combinations of homologs from paternal an
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Answer:

Crossing over.

Explanation:

Crossing over may be defined as the phenomena of exchange of the genetic material between the non- sister chromatids of the homologous chromosomes. The crossing over occurs at the pachytene stage.

The crossing over may provide a source of genetic variation as it can create variation in the homologs of paternal and maternal lineage, present within a haploid cell. This crossing over occurs during the process of synapsis.

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