What rate comes closest to the maximum rate of carbon dioxide fixation you have measured in this activity?
a. 75 microliters/min
b. 110 microliters/min
c. 130 microliters/min
d. 220 microliters/min
b
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You are an experienced naturalist and biologist and you observe two birds mating that you do not believe to belong to the same species
The eggs from this breeding do not hatch, and when you obtain one of the eggs, you find embryonic development stopped not long after fertilization. Which of the following conclusions is supported by these observations? A. Pre-zygotic isolation prevented successful reproduction. B. Post-zygotic factors prevented successful reproduction. C. Behavioral isolation prevented successful reproduction. D. Temporal isolation prevented successful reproduction. E. This is evidence to suggest the two types of birds are a single species.
In bryophytes and some other plants, which of the following is a protective structure where sperm cells are formed?
a. archegonium b. strobilus c. stoma d. antheridium
Beyond maintaining water balance in the blood, the kidneys
A. help to maintain the blood pH. B. maintain blood volume. C. aid in regulation of blood pressure. D. All of the choices are kidney functions.
Which of the following is not involved in positional information for pattern formation?
A) apical ectodermal ridge B) zone of polarizing activity C) cadherins D) fibroblast growth factors E) Sonic hedgehog