Trees are able to transport water from the roots to the top branches because
A. cohesion bonds water molecules to each other strongly.
B. liquid water has a higher density than the air in the plant cells of the roots, trunk, and branches.
C. water acts as a solvent of the tree cells as it moves upwards to the branches.
D. adhesion bonds water molecules to the inside of the plant conducting tubes.
E. leaves are hydrophilic.
D. adhesion bonds water molecules to the inside of the plant conducting tubes.
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The aspect of human evolution in which the genes microcephalin and ASPM have been implicated is the
A. evolution of our large frontal cortex. B. evolution of language. C. evolution of bipedal locomotion (walking upright). D. evolution of an opposable thumb. E. the evolution of mother-infant bonding
Four of the five answers below characterize one group of chordates. Select the exception
a. feathers b. endothermic c. four-chambered heart d. hollow skeleton e. small teeth
An organ is defined as
a. a single tissue grouped together to perform a specific function. b. 2 or more tissues in specific proportions grouped together to perform a specific function. c. cells of different tissues linked together by the circulatory system to allow multiple functions. d. only the reproductive parts in plants. e. none of these.
If a bird eats an insect that ate a plant, the bird is considered a(n)
A) autotroph. B) producer. C) secondary consumer. D) primary consumer. E) tertiary consumer.