Answer:
Ivan was born in Russia, but his mother was born in the United States.
Ethan’s parents were both born in Israel, but he was born in the United States.
Pedro’s parents were both born in Spain, but he was born in the US territory of Puerto Rico.
Explanation:
If you are born in the US you are automatically a citizen. If one parent is born in the US you are a citizen.
I believe it is the third choice, there was nothing then a sudden explosion, creating the universe
Mt. Vesuvius is A VOLCANIC MOUNTAIN.
It was famously known for causing the fires of Pompeii and killing millions of people.
Mt. Vesuvius, a cone-shaped mountain is part of the Campainian Volcanic Arc. It has erupted 30 times as recorded by scientists. It is currently considered as one of the top ten most dangerous volcanoes of the world.
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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 .
