The first version of a product, which is built and tested during the third stage of technological design, is called a

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The element that has the greatest electronegativity is

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false