How Are Galaxies Important to Our Existence

question 71

Multiple Choice

How are galaxies important to our existence?

• A)Without galaxies,there could not have been a Big Bang.
• B)Without galaxies,the universe could not be expanding.
• C)Galaxies prevent planets from leaving their orbits around stars;e.g. ,our galaxy prevents Earth from leaving its orbit of the Sun.
• D)Galaxies recycle heavy elements produced in stars into future generations of stars.
• E)Galaxies provide the gravity that prevents us from falling off Earth.

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Definitions:

Myosin

A type of protein found in muscle fibers that acts with actin in muscle contraction and movement.

Ribose

A pentose sugar that is a crucial component of RNA (ribonucleic acid).

Glial Cells

In nervous tissue, cells that support and nourish neurons; they also communicate with neurons and have several other functions; also see astrocyte, oligodendrocyte, ependymal cells, and microglia

Neurons

Specialized cells in the nervous system that transmit information through electrical and chemical signals.