PLEASE HELP ASAP Which of the following statements about tornadoes is true?

A. Tornadoes result from all thunderstorms.

B. Most tornadoes form during the afternoon.

C. Most tornadoes have funnels shorter than 105 m (344 ft).

D. Most tornadoes have wind speeds less than 105 kph (65 mph).

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Which of the following contributes to the structural rigidity of cellulose? adjacent glucose polymers are stabilized by hydrogen bonding. glucose residues are joined by (α1→4) linkages. cellulose is a highly branched molecule. the conformation of the glucose polymer is a coiled structure.

Displacement is the slope of a velocity vs. time graph a. true b. false