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navik [9.2K]
2 years ago
12

Which organism infects the tissues of the throat and cause the disease diphtheria?

Biology
1 answer:
aniked [119]2 years ago
7 0
Corynebacterium is the answer I believe
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Scientists developed the ________ model after their studies of the fossil record revealed that some species appear quite suddenl
tatuchka [14]

Answer:

Punctuated Equilibrium

Explanation:

The phyletic gradualism model and the punctuated equilibrium are aspects models of macroevolution that are characterised with varying patterns.

However, the punctuated equilibrium model of evolutionary history consists of geologically long periods of inactivity (stasis) with little or no evolution, interrupted or "punctuated" by geologically short periods of rapid evolution.

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3 years ago
HELP ME PLEASE! List the steps scientists for using technology to find the half-life of an isotope.​
liubo4ka [24]

For radioactive materials with short half-lives, you use a very sensitive calibrated detector to measure how many counts per second it is producing. Then using the exact same set up you do the same at a latter time. You use the two readings and the time between them to determine the half-life. You don’t have to wait exactly a half-life, you can do the math with any significant time difference. Also, you don’t need to know the absolute radioactivity, as long as the set up is the same you only need to know fraction by which it changed.

For radioactive materials with long half-lives that won’t work. Instead you approach the problem differently. You precisely measure the mass of a very pure sample of the radioactive material. You can use that to calculate the number of atoms in the sample. Then you put the sample in a counter that is calibrated to determine the absolute number of disintegrations happening in a given time. Now you know how many of them are disintegrating every second. You use the following equations:

Decays per Second = (Number of Atoms) x (Decay Constant)

Half-life = (Natural Log of 2) / (Decay Constant)

And you can calculate the half-life

Hope it helps :)

Mark it as brainliest pls :)

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3 years ago
A(n) ________ is a variable that affects both variables of interest and may falsely give the impression of a cause-and-effect re
almond37 [142]
It is the independent variable. Because it can have an effect on the dependent variable.
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3 years ago
Why is cholesterol important for the body
GalinKa [24]
<span>We need a small amount of blood cholesterol because the body uses it to: build the structure of cell membranes. make hormones like oestrogen, testosterone and adrenal hormones. help your metabolism work efficiently, for example, cholesterol is essential for your body to produce vitamin D.</span>
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3 years ago
Read 2 more answers
HELP! NOW!!!!!!
sukhopar [10]

Answer:

C.

Explanation:

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