When a patient is suspected of having a concussion, or brain injury, doctors often turn to computed tomography, or CT, scans to find out for sure. In a CT scan, a series of X-rays is taken. Each one shows an individual "slice" of the brain, and they can be combined to form a complete three-dimensional picture. Because of the amount of radiation patients are exposed to, however, doctors question the use of the scans, especially for children. Now researchers have proposed an alternative way of diagnosing head injuries: a simple blood test. The test detects proteins that burst out of brain cells into the bloodstream immediately after an injury. It allows doctors to determine whether a patient has suffered head trauma and needs further treatment. What is the main idea of the passage?

Which piece of evidence would best support reason #1? othe history of using animals for research extends asfar back as 322 bce, when early greek physician-scientists, such as aristotle and erasistratus,performed various experiments on living animals.animal research played an essential role in thedevelopment of herceptin and tamoxifen, twomedications that have already saved the lives ofthousands of women who have been diagnosed withbreast cancer.even those who believe in testing on animals when it is hnecessary for vital medical research practice what isknown as "the 3 rs-reduction, refinement, andreplacement to reduce the number of animals usedfor testing.biologists believe that chimpanzees share at least 98.4percent of the same dna as humans and gorillas shareat least 97 percent, making primates a popular andlikely choice for the testing of products intended for humans

What human capital are students acquiring when they take a robotics , an honors class divided into teams for tool acquisition , design , and public relations?

"she is his achilles' heel" is an example question 3 options: a allusion b alliteration c simile d personification