Researchers paul ekman and wallace friesen conducted facial recognition experiments to determine which of the following?

if cultures differ in social gestures used to represent emotion
if cultures differ in words used to label emotions
if emotional expressions were recognizable across cultures
if cultures had different display rules for emotion

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?