True or false: Symbiotic relationships between species do not change over time
A. true
B. false
B
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Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment. B) interactions among species have no significant influence on community structure. C) when one species is removed, the populations of the other species are unaffected. D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
The balance between photosynthesis and ___________ is altered by the combustion of fossil fuels.
A. respiration B. sunlight C. growth D. decomposition
Within the cells of plants that form the xylem and phloem a unique process occurs. The water molecules bond to each other. What is this process called?
A) adhesion B) cohesion C) nonpolar D) covalent bonding
The location of the pericycle is best described as
A) between layers of primary xylem and primary phloem. B) the outermost layer of the root vascular cylinder. C) a band wrapped around cells of the endodermis. D) just beneath the epidermis. E) adjacent to the shoot apical meristem.