True or false: a cross product is an equation which states that two ratios are equal.

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Iwill give brainliest if you answer right : )

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves