Irrigation can cause salt to accumulate in the soil, a process known as:
a. erosion.
b. decomposition.
c. mineralization.
d. salinization.
e. weathering.
d
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During which era did the dinoflagellates, coccolithophorids, and diatoms appear?
A. Paleozoic Era B. Mesozoic Era C. Cenozoic Era D. Neoproterozoic Era E. Paleoproterozoic Era
Which of the following statements is NOT
related to the first law of thermodynamics?
a. energy flow is from a high concentration to a low concentration. b. the amount of energy in the universe is constant. c. energy cannot be created or destroyed. d. energy can change from one source to another. e. the energy of the universe has existed forever.
The primary function of each of the following is for adhesion of a cell to another cell or the extracellular matrix except
A) desmosomes. B) hemidesmosomes. C) plaques. D) connexins. E) cadherins.
All of the following are vesicles of the five vesicle stage, EXCEPT
A. Diencephalon B. Forebrain C. Mesencephalon D. Metencephalon E. Myelencephalon