Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. Which biological process accounts for the oscillating pattern observed in this dataset?
A. photosynthesis
B. respiration
C. More information would be needed to
answer this question.
A
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Of the primates listed below, a human’s closest extant relative is a(n)
A. South American spider monkey. B. mandrill. C. orangutan. D. ring-tailed lemur. Gather Content · What do you already know about primate relationships? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Nucleotide-containing molecules that move hydrogen atoms and electrons from one reaction site to another are known
as ____________________. Fill in the blank(s) with the appropriate word(s).
The extracellular ground substance of the matrix is composed of ____
a. cartilage b. polysaccharides c. lipids d. proteins e. elastin
Which of the following is the outer layer of plasma membrane and elastic proteins that protects and gives shape to many unwalled, single-celled protists?
A. Eyespot B. Capsid C. Pellicle D. Chitin E. Cilia