Which statement about the connection between subcellular and extracellular components is the most correct? A. Gap junctions are necessary for communication and growing embryos and tissues, such as heart muscle. B. Desmosomes are necessary for communication and tissues, such as muscle cells. C. Tight junctions are bound together by specific keratin proteins. D. Plasmadesmata are typically found interspersed within the cell walls of many types of bacteria.

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.