A class of science students investigates and records short term effects of a tornado that destroyed an area near the school which change was not caused by the tornado a:trees were knocked down
b: species of squirrels became extinct
c: flooding damaged dam
d: Buildings were destroyed

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g