The “steady state theory” suggested that the universe has always existed and maintainsthe same structure. This theory was later discredited due to which discovery? (S6E1.a) Your

A. The amount of hydrogen in the universe is extremely high to remain steady.

B. The scale of the universe is much greater than was previously understood.

C. The shift of light toward longer wavelengths indicates that most galaxies are moving away from Earth.

D. More powerful telescopes have made observations of planets orbiting stars other than the Sun.

at the bottom

explanation:

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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