In the 19th century biologists began taking a closer look at both animal and plant tissues, perfecting cell theory. Scientists would readily tell that plants were completely made up of cells due to their cell wall. however this was not so obvious for animal cells, which lack a cell wall. Many scientists believed that animals were made of globules. Which idea is best supported by this paragraph?

Shaken by the collapse of the steel industry, which had provided them with an unshakable sense of identity for more than a century, pittsburghers hunkered down and built a new economy based on services, medicine, education, and technology. in the process, they transformed their community from one driven by quantity of production into one devoted to quality of life. —peter miller, "pittsburgh: stronger than steel," national geographic, december 1991. the community remodeling carried out in pittsburgh was accomplished partly through the conversion of old factories for new uses—a process known as a. urban renewal. c. gentrification. b. retooling. d. urban pioneering.

How do convection currents form underwater mountains?

Is an official language in every north african country