The MRI scanner measures this signal difference and displays the activity as a colored area (Figure 1). Diffusion Tensor Imaging (DTI) is a technique that detects how water travels along the white matter tracts in the brain (Figure 2). White-matter tracts connect different parts of the brain and must be protected during surgery. A dye (contrast agent) may be injected into your blood stream.
Quick Answer. Diving bell spiders of the species Argyroneta aquatica have the ability to swim, and they use this adaptation to live underwater. Although they live and swim in the water, diving bell spiders still breathe air by creating air pockets underwater that they use as homes. Continue Reading.
Birds, lizards, snakes, scorpions, and other spiders all prey on spiders. Some insects also hunt down spiders, including the mantis and a wasp that specializes in catching and paralyzing spiders. The wasp buries the spider alive, so that its young can feed on fresh food when they hatch. Printer Friendly.