Auroras are lights that appear at Earth’s northern and southern poles. What is the main cause of an aurora?

1 answer:

6 0

When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights

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Which best describes the purpose of president kenney peace corps program

finlep [7]

Answer:

To help in developing nations, by improving health care, agriculture, and other areas.

Explanation:

President Kennedy wanted to have what the Soviet Union had. He wanted the United States also to be connected in actively pursuing the cause of global democracy, development, peace, and freedom. The Peace Corps was established on March 1, 1961, as mandated by the Executive Order signed by President Kennedy. It was done to give social and economic development abroad, using technical assistance. While increasing mutual understanding between Americans and populations served.

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3 years ago

In 2001, Bacillus anthracis endospores were sent in letters to various locations in the United States. The recipients of the let

ki77a [65]

Answer:

It's going to be:

A-Endospores can survive extreme heat, lack of water, radiation, and exposure to many toxic chemicals.

C-Endospores are highly durable dehydrated cells with thick cell walls.

ANSWER IS A and C

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3 years ago

The data obtained from the meselson–stahl experiment after one generation of replication eliminated the dispersive model of dna

Sedaia [141]

<h2>Given statement is false</h2>

Explanation:

According to dispersive model of DNA replication,DNA molecules are hybrids of parental and daughter DNA;In this model each individual strand is a combination of original and new DNA

Meselson and Stahl did an experiment on DNA replication using E.coli bacteria

E.coli was grown in a medium containing heavy isotope of nitrogen,bacteria took up the nitrogen and used to synthesize new biological molecules,including DNA
It was grown for many generations,the nitrogenous bases of the bacteria's DNA were all labelled with heavy nitrogen
Bacteria were then switched to light nitrogen isotope and allowed to grow for several generations
They then measured the density of the DNA using density gradient centrifugation
This method separates molecules such as DNA into bands by spinning them at high speeds in the presence of another molecule, such as cesium chloride
Each DNA produced two DNA molecules each with one new strand and one old strand called semi conservative replication(half of the parental DNA conserved in daughter DNA)
Each DNA strand act as a template for synthesis of new strand
Hence,dispersive model of DNA was eliminated and semi-conservative model of DNA replication was proved by the above experiment