Which one of the following is not a step used for balancing chemical equations?
A. Count the atoms in each substance in the reactants and products.
B. Choose coefficients that will balance the equation.
C. Determine how long the reaction will take.
D. Write the chemical equation using formulas and symbols.

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

In a cladogram, what occurs at a node? a derived trait appears. evolution is stopped. an ancestor dies. the cladogram ends. aa as s as ss what are the chances that their offspring will have sickle cell anemia? 0% 25% 50% 100%

Match each medication with its description.