If you hit $0 Avail. funds for trading, your account will go into a margin call and Ameritrade will force you to sell positions or deposit money. I'm going to assume your Account Balance isn't -8.1k because you would have hit a margin call long before your account went negative unless this all happened overnight.
Sadly, these peaceful animals may not survive into the next century. Ape conservationists say time is running out, as there are only about 720 mountain gorillas left in the world, and the majority of gorilla populations are plummeting.
As one of the great apes, mountain gorillas are the largest of the living primates. They have muscular arms, a massive chest, and broad hands and feet. Their thick black hair helps insulate them from cold weather. census in 2011 recorded fewer than 900 mountain gorillas left in the wild. For mountain gorillas, their biggest threats come from deforestation and the regionâs growing population. The forest where mountain gorillas live is fertile and rich in biodiversity.