Nebulas are birthplaces for new stars. true false

The given statement is true.

Explanation:

Nebulas are the interstellar clouds composed of dust, hydrogen gas, helium gas and other ionized gases.They are cold clouds in which star is born.

These atoms of gases come closer to each other due to gravity and form a clump.

In clumps, these atoms of gases get compressed under the action high pressure by which nuclei of these atoms undergoes fusion reaction.The energy released due to this fusion reaction is in the form of heat and light.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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