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.

1. Watch a ship sail off to sea

Without being in the sky, it is impossible to see the curvature of the Earth. However, you can always see a demonstration of this if you visit a harbor or any place with a wide-open view of the water.

If you are able to watch a ship sail off to sea, watch its mast and flag as it fades off into the distance. You will notice that, in fact, it does not "fade off into the distance" at all