Glucose + oxygen. 6CO2 + 6H2O → C6H12O6 + 6O2.
The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).
<span>Population crash is a sudden decrease in the number of people found in a given area as a result of shortage or the lack of environmental resources necessary for reproduction, survival and growth of the population. It is also known as a die back. The answer to your question is A. population crash.</span>