In some parts of Mexico, ________ has become a viable alternative to green plants as a primary nutrient source.
Fill in the blank(s) with the appropriate word(s).
spirulina
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Refer to the accompanying figure. What is the process occurring in the cells labeled as 3 in the sequence?
a. mitosis
b. conjugation
c. the first meiotic division
d. exchange of micronucleus
e. the second meiotic division
Compared to life in the water, what was one benefit to a transition to living on land 450 mya?
A. easier to withstand gravity B. easier to find pollinators C. less CO2 D. easier access to water E. more abundant sunlight
____________________ are evidence of life in the distant past.
Fill in the blank(s) with the appropriate word(s).
Bacteria that require special growth factors and complex organic substances are called
A. harmless. B. aerobic. C. anaerobic. D. fastidious. E. pathogenic.