Why is heartwood darker in color than sapwood?
a.
heartwood is closer to the center of the stem; sapwood is away from the center of the stem.
b.
heartwood does not conduct water; sapwood is active in fluid transport.
c.
heartwood contains xylem tissue; sapwood contains phloem tissue.

Monitor and apply fix up strategies

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous

which is an effect of short-term environmental changes? a) adaptation b) speciation c) extinction d) death (5 points)