Study 2: a study published in the journal of the american medical association (volkow et. al., 2011), indicates that cell phone use speeds up activity in the brain. as part of a randomized crossover study, 47 participants were fitted with a cell phone device on each ear and then underwent two positron emission topography, or pet, scans to measure a specific type of brain activity. during on scan, the cell phones were both turned off. during the other scan, an automated 50-minute muted call was made ot the phone on the right ear. the order of when the call was received (for the first or second scan) was randomized. comparison of the pet scans showed a significant increase in activity in the part of the brain closest to the antenna during the transmission of the automated call. for each study identify the response variable and explanatory variable.

Populations of blue-winged warblers, a type of bird, migrate south in the winter and return to canadian breeding grounds in the spring. as global temperatures have increased due to climate change, spring has started arriving in the warbler's breeding grounds earlier in the year, before the warblers return. warblers now arrive at their breeding grounds too late to select ideal nesting sites and to feed on important early-spring food sources how are populations of blue-winged warblers most likely to be affected by the earlier arrival of spring? o a. populations will go extinct since the warblers will stop migrating to breeding grounds. b. populations will be unaffected since most species can quickly adapt to effects of climate change. c. populations will increase since warmer temperatures are generally beneficial to survival, d. populations will decline since individuals will be less likely to successfully reproduce, reset next

Someone me with this: a mineral' is determined by its actomic structure.

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled