If you are enabled for margin trading, you can easily get a margin balance by simply buying more shares than you have money deposited for, or withdrawing money from the account in amounts higher than your cash balance. Ameritrade just acts like you have the money in both circumstances and allows the transaction.
4. Mosquitoes vary in their size: they reach 1.6-12.5 mm (0.5 inch). Fossil mosquitoes were even 5 cm (2 inch) long. 5. Mosquitoes do not bite, they suck. 1,200,000 mosquitoes would be necessary to completely drain the average human of blood. Well, unless you die before, but of irritation. 6. An experiment in the Canadian tundra found that people who bared arms, legs and torsos reported approximately 9,000 bites per minute from swarming, newly hatched mosquitoes.
In aquatic environments mosquito larvae serve as a food source for fish. In other habitats, spiders, salamanders, frogs, reptiles, and other insects consume mosquitoes. Mosquitoes themselves feed on decaying leaves, organic debris, and microbes. They serve as pollinators as well. Around 3,500 known species of mosquitoes occupy every continent and every conceivable habitat.