Nonvascular plants lack _____

a. spores
b. gametes
c. zygotes
d. seeds
e. chloroplasts


ANSWER: d

Biology & Microbiology

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Damage to the substantia nigra, a specific region of the basal ganglia, can produce the resting muscle tremors characteristic of what disease?  

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What concepts enable two or more species with similar niches to coexist in a community? Select all that apply.

A. allopatric competition B. resource partitioning C. bottom-up control D. overlapping niches E. character displacement

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According to the animation, what does the electron transport chain do to the concentration of hydrogen ions (protons)?

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Microfilaments differ from microtubules in that microfilaments

A) are thicker than microtubules. B) are found only in plants, whereas microtubules are found in both plant and animal cells. C) are mainly composed of actin, whereas microtubules are composed of tubulin. D) help to anchor organelles, whereas microtubules primarily function to help cells change shape and move.

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