Girdling is a procedure to kill unwanted tress by cutting a groove into the bark of the tree
The groove must completely encircle the trunk and should penetrate into the wood to a depth of at least -inch on small trees, and 1- inches on larger trees. Why does this procedure cause tree death? A) No water can be transported from the roots to the leaves.
B) No water can be transported from the leaves to the roots.
C) No sugars can be transported from the leaves to the roots.
D) Both water and sugars are prevented from being transported.
C
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Which trait is an example of a qualitative trait in humans?
A) height B) skin color C) Huntington's disease D) intelligence
John Snow’s work with cholera cases laid the foundation for the science now known as ________, which investigates the occurrence, spread, and distribution of human disease
immunology chemotherapy epidemiology parasitology
The element carbon has 6 protons and 6 neutrons in its nucleus. Which of the following represents the carbon-14 isotope?
a. 6 protons, 8 neutrons b. 6 protons, 7 neutrons c. 7 protons, 6 neutrons d. 8 protons, 6 neutrons
In a food chain with four trophic levels, what would be the energy in the top trophic level if the energy contained in the primary producer level is 40,000 kcal/m2/yr? Assume a trophic level transfer efficiency of 10%.
A. 4,000 kcal/m2/yr B. 40 kcal/m2/yr C. 0.4 kcal/m2/yr D. 4 kcal/m2/yr E. 400 kcal/m2/yr