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lilavasa [31]
3 years ago
10

The toxicity of marine pollutants is evaluated through bioassays by a) calculating the concentration at which 50% of the test or

ganisms of a particular species die b) determining the length of time the pollutant remains in the environment c) estimating the number of trophic transfers in the food web affected by the pollutant d) determining the total biomass of affected organisms in the environment
Geography
1 answer:
aleksklad [387]3 years ago
3 0

Answer:

a) calculating the concentration at which 50% of the test organisms of a particular species die

Explanation:

Bioassays -

<u>Bioassays is an analytical method to assess the effect of marine pollutant on the organism by estimating the concentration at which 50% of the test organisms die after exposing the test organisms for a specified time.</u>

It can be done  by quantitative or by qualitative experiment , or direct or indirect .

It is used to detect the biological hazards or give the quality assessment of the mixture .

It is also used for the monitoring the quality of water .

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23: List the different types of radiation according to wavelength? Please put them in the order of longest wavelength to shortes
Butoxors [25]

Explanation:

Radiation means ‘energy that is transported from one spot to another without the need of direct contact between the two locations’, Light in each carries a different amount of energy, this is what we call electromagnetic radiation or electromagnetic waves. Gamma rays are the most energetic, and radio is the least.

<em>In order from longest to shortes wavelenghts we have:</em>

  • Radio waves: they are made by various types of transmitters, given off by stars, sparks, and lightning, they have the lowest frequencies (longest wavelenghts) in the electromagnetic spectrum and are used mainly for communications.
  • Microwaves: they are extremely high-frequency radio waves (Their wavelength is usually a couple of centimeters) made by various types of transmitters.
  • Infra-red waves: they are just below visible red light in the electromagnetic spectrum, they're given off by hot objects.
  • Visible lights is the tiny part of the electromagnetic spectrum our eyes can detect.
  • Ultra-Violet: this light is given off by the Sun in large quantities. We call it "UV" for short and can also be used to kill microbes.
  • X-rays: they are very high-frequency waves that carry a lot of energy. They will pass through most substances, and this makes them useful in medicine and industry to see inside things.
  • Gamma rays: they are given off by stars and by some radioactive substances. They are extremely high-frequency waves (the shortest wavelength) and carry a large amount of energy. They pass through most materials.

In the image, I annexed you can see the electromagnetic spectrum with the type of radiations from the shortest to the longest wavelengths.

I hope you find this information useful and interesting! Good luck!

4 0
2 years ago
What is the role of women in development?​
zheka24 [161]

Answer:

The role of women in rural development, food production and poverty eradication. ... Rural women are key agents for development. They play a catalytic role towards achievement of transformational economic, environmental and social changes required for sustainable development.

5 0
2 years ago
The theory of plate tectonics states that the Earth’s crust is broken into many pieces called __________.
stepladder [879]

Answer:

C) plates

Explanation:

5 0
3 years ago
During the red scare of 1919-1920, ________ led the attack on the alien threat.
Serggg [28]

<u>Answer:</u>

<em>b. Mitchell palmer </em>

<em></em>

<u>Explanation:</u>

The sequence of raids occuring were called the Palmer Raids. These raids were aimed at capturing the immigrants and deporting them out of the United States. Palmer, the Attorney General, was responsible to lead and carry on the raids.  World War I and Russian revolution resulted in fear and rejection for the immigrants in the US. This was named the Red Scare. This fear among the people of the US gave momentum to the Palmer raids. The immigrants and non-residents of the US were referred as aliens.  The US Labor Department was upset by these raids as this went against their authority to deport people.

5 0
3 years ago
Briefly describe Aristotle's influence on the science of geology.
fredd [130]

Answer:

Aristole proposed that the Earth was actually round, contractiary of religious beliefs

Explanation:

He believed that the Earth was round and that influenced alot on the way we think about the science of geology.    

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3 years ago
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