Answer:
Elliptical galaxies, such as M87 have very little gas and dust. ... Both the largest and the smallest known galaxies are elliptical. Very large elliptical galaxies can reach 300 million light years in diameter. Dwarf ellipticals, which are very common, may contain only 1/100,000th as many stars as the Milky Way!
Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole. Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.
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The tissue in which all cells contact the basement membrane, even though some appear (at first glance) to be stacked on top of others, is called pseudostratified <span>columnar epithelium.
</span> The pseudostratified columnar epithelium has epithelial cells whose nucleis are at different levels.
<span>The upper respiratory tract epithelium is example of this type of epithelium.</span>
