For a rotating column of air connected to a storm cloud to be
considered a tornado, it must do
which of the following?
A. reach speeds of at least 300 kilometers per
hour
B. last for over 15 minutes
C. make contact with the ground
D. occur during the day

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries