Cnidaria is a phylum within Kingdom Animalia which consists of hydras, jellies (or jellyfish), sea anemones, and corals. All cnidarians are radially symmetrical, and there are two main radially symmetrical body types.
The stock market crash, on black Tuesday (October 29, 1929) began the Great Depression.
This caused the Great Depression because just like buying on margin, people couldn't pay back what they borrowed. black tuesday. October 29, 1929; the day the stock market crashed. It is a cause of the Great Depression because it is what made everyone lose there money.