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Setler [38]
2 years ago
5

What do you think? Were zebra mussels intentionally transported to the U.S.? Explain your reason for your answer.

Biology
1 answer:
UkoKoshka [18]2 years ago
6 0

The transport of zebra mussels to the US took place involuntarily through the discharge of ballast water from European ships with contaminated cargo, in the 1980s, spreading across the Great Lakes region.

<h3 /><h3>Impacts on the environment</h3>

This freshwater mollusk can negatively impact the environment by filtering out algae that feed native species and clogging up water transport and storage systems.

Therefore, due to its high reproduction rate, zebra mussels spread rapidly and render water systems unusable, generating significant ecological and economic impacts.

Find out more information about zebra mussels here:

brainly.com/question/368887

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Sound quality can be divided
iris [78.8K]
Sound quality can be divided into amplitude, timbre and pitch. If there’s an impedance mismatch between your two devices connected to the single output, you could have a large mismatch between the levels arriving at each device. If the difference is large enough, one device may have distorted or inaudible audio.

To avoid this, you should ensure that both devices connected to the split signal are similar - such as 2 pairs of headphones, 2 recorder inputs, and so on. When you place 2 devices with wildly differing load impedances on a splitter is when you’ll encounter problems - such as headphones on one split and a guitar amp input on the other.

To get around this, you can use either a distribution amplifier (D.A.) or a transformer balanced/isolated splitter - which will work over a larger range of load impedances, typically. Depends on the quality of the splitter and the exact signal path. If you’re using the splitter to hook two things into one input, and you’re using quality connectors, you probably won’t lose much quality. There can be an increase in impedance of the cable due to the imperfect continuity of the physical connection, however with unbalanced line-level signals, impedance at both ends of the chain tends to be orders of magnitude higher than the connection will create, so one split will be barely noticeable. So too, the noise increase from the additional length of cable.

Now, one source into two inputs, that will by basic math and physics result in a 3dB drop in signal strength, which will reduce SNR by about that much. By splitting the signal path between two inputs of equal impedance, half of the wattage is being consumed by one input and half by the other (the equation changes if the inputs have significantly different impedances). So each input gets half the wattage produced by the source to drive the signal on the input cable, and in decibel terms a halving of power is a 3dB reduction. Significant, until you just turn the gain back up. The “noise floor” will be raised by however much noise is inherent in the signal path between the split and the output of the gain stage; for pro audio this is usually infinitesimal, but consumer audio can have some really noisy electronics, both for lower cost and because you’re not expected to be “re-amping” signals several times between the source and output.

8 0
3 years ago
True or false: Theoretically, it is possible (but very difficult) for a population to not evolve for a while.
Debora [2.8K]

It is true that it is possible for a population to not evolve for a while.

There is something called the Hardy-Weinberg theorem, which characterizes the distributions of genotype frequencies in populations that are not evolving.

There are 5 Hardy-Weinberg assumptions:

  • no mutation
  • random mating
  • no gene flow
  • infinite population size
  • and no selection (natural nor forced).

You can see that some of these are kinda extreme and really hard to get, but with approximations, we can work.

For example, instead of an "infinite population size" we have enough with a really large population, such that genetic drift is negligible.

Concluding, yes, it is possible (but really difficult) for a population to not evolve for a while (at least, in nature), as long as the 5 assumptions above are met.

If you want to learn more, you can read:

brainly.com/question/19431143

7 0
3 years ago
Biologists classify organisms in order to make them easier to find and understand.
sleet_krkn [62]
True
Pls give me brainliest
3 0
3 years ago
Read 2 more answers
Compare mitosis with meiosis by filling in the chart below:
Elena-2011 [213]

Answer:

22:- in mitosis stem cells and somatic cells cell division occurs and in meoisis germ cells cell division occurs

23:- at end of mitosis 2 daughter cells formed and meiosis 4 daughter cells formed

24:- in mitosis cells are same and in meiosis cells are different

l know only those questions answers

3 0
3 years ago
_____ influences are stronger predictors of bipolar disorder than of depressive disorders.
n200080 [17]

Answer:

Genetic

Explanation:

Genetics has an influence of 60-85 % of chances of inherting bipolar disorder.

The responsible for this is GRK3. The recommended genetic test is called PSYNOME.

Its operational principle is to look for 2 mutations in the gene above.

Basically bipolar disorder is a state of mentally health conditions in which there is a shift in mood of an induvidual,his energy and behavior.it is always refer to as Manic depression because of the switch in the mood and sometimes aggressive behaviours.

3 0
3 years ago
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