The metabolic pathways that produce ATP may be either ___ or ____ depending on the availability of oxygen.
Fill in the blank(s) with the appropriate word(s).
aerobic
anaerobic
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______ have a complex placenta during gestation.
a. Eutherian mammals b. Monotremes c. Marsupials d. Echidnas
Which of the following are the most abundant cell type found in most plants?
A) parenchyma cells B) collenchyma cells C) sclerenchyma cells D) food-conducting cells
Viruses differ from cells in that viruses
A) are alive. B) contain DNA or RNA, but not both. C) only reproduce asexually. D) have more genes.
Since the beginning of the twentieth century, the rate at which CO2, CH4, and nitrogen oxides have been released into the atmosphere has outpaced the rate at which they can be recycled. Thus these ________ ________ are accumulating in Earth's atmosphere and are correlated with an increase in the global annual-mean surface air temperature.
What will be an ideal response?