Vaccines ________.
Fill in the blank(s) with the appropriate word(s).
Answer: have a very slight potential to cause disease
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The longer two species have been evolving on their own, the greater the number of _____ that accumulate between them
a) genetic difference b) homologous structures c) convergences d) DNA bases e) genetic similarities
Three types of nitrogenous wastes formed from the breakdown of protein are pictured in the diagram. 
a- Explain the relationship of the water needed to excrete the wastes and the energy required to produce the wastes.b- How is the energy needed to produce the waste and the water needed to eliminate the waste related to the nature of each waste product?c- Tell what types of organism produce each type of waste.
What will be an ideal response?
The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments B. is a spherical organism C. uses nitrite as a source of nitrogen D. fixes N2 during the day
The Z scheme in oxygenic photosynthesis illustrates electron transfer among molecules, which are plotted according to their differences in
a. redox potential in volts. b. energy measured in joules. c. flow rate measured in seconds. d. electron energy in ?.