What is the control variable of Alexander fleming

True or false: the revolution of the earth creates day and night as it rotates around the sun

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves