Humans inhale by negative pressure.
Answer the following statement true (T) or false (F)
True
The creation of a partial vacuum in the alveoli causes air to enter the lungs.
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Mammals have a family of 500 and 1000 genes that encode receptor proteins on the surface of odor-receptor neurons. If all mammals have these genes, why do some mammals have a better sense of smell than others do?
A) Some of the genes actively transcribing receptor proteins in some species are completely absent in other species. B) Some of the genes may have been mutated and rendered inactive in some species but not in others. C) Some species, particularly humans, rely much less on odor detection for survival; thus, the genes have mutated to encode proteins that aid in other senses, such as sight. D) Some species of mammals have a larger set of "basic odors" than other species.
Which of the following represents the correct order of evolution of requirements for complex multicellularity in animals?
A. adhesion, cell signaling, gap junctions, bulk transport B. adhesion, gap junctions, cell signaling, bulk transport C. gap junctions, cell signaling, adhesion, bulk transport D. bulk transport, adhesion, gap junctions, cell signaling
Which plant hormone is used in the product in the
above figure? a. auxin b. gibberellin c. cytokinin d. abscisic acid e. ethylene
Scientific experimentation generally leads to more questions
Indicate whether the statement is true or false