Measuring electrical activity of the brain over time is done using
a. pet scans
b. eegs
c. mris
d. ct scans

The correct answer for the fill in the blank is B) EEGs.

EEG stands for Electroencephalogram, which is a test used for recording electrical activity of the brain. In this test, electrodes are placed along the scalp, which are used to detect the voltage fluctuations within the neurons of the brain that are produced because of ionic currents.

It is generally used to diagnose any abnormality related to brain like Epilepsy, sleep disorders.

the man is bald so he has no hair to get wet

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.