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which of the following is true regarding respiration in birds?
a) it is inefficient because blood is pumped to the lungs under very low pressure.
b) it is inefficient because oxygen-poor air mixes with oxygen-rich air during inhalation.
c) it is highly efficient, as a bird’s circulatory system includes three circuits.
d) it is highly efficient, as oxygen-rich air enters the lungs even while a bird is exhaling.

The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses

Charles darwin published his theory of evolution in 1859. in what way foes modern evolutionary theory differ from the theory as proposed by darwin? a) darwin inferred that individuals can evolve, but modern generic science has shown that this is not true. b)darwin inferred that individuals do not evolve, but modern genetic science has shown that this is not true. c)modern science has disproved most of darwin's original theory of evolution, because darwin knew nothing about generations and their role in heredity. d)generic studies have shown that gene expression and other factors operate along with natural selection, but most of darwin's theory has been supported by modern science.

The term used to describe a disease-causing microorganism isa. virus. b. infection. c. pathogen. d. microbe. e. bacterium.