Identify two adaptations in different living organisms and use natural selection to explain how each may have
logically evolved. What will be an ideal response?
Example 1: The long, flexible tongue of a frog is an adaptation for catching insects. In a
population of frogs much genetic variation would exist with respect to tongue length.
However, those frogs having longer tongues would be able to catch more insects than the
short-tongued frogs which might be weak and even starve. Over many generations frogs
having long tongues would most likely thrive and produce more offspring than frogs having
short tongues, and consequently the long-tongue trait would become more and more
prevalent in the population.
Example 2: The thick coat of the polar bear is an adaptation for surviving low temperatures.
In a population of polar bears much genetic variation would exist among coat thickness.
However, those bears having a thinner coat would be more adversely affected by the low
temperatures, for example they might be sickly, be less fertile, and even die. Over many
generations, bears having thicker coats would most likely thrive and produce more offspring
than thin-coated bears, and consequently the thick-coated trait would become more and more
prevalent in the population.
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The inner lining of the uterine wall that is filled with tiny blood vessels is the.
Hormones are chemical messengers transported by the ____ that can have ____
a. blood: stimulatory or inhibitory effects b. lymph ducts; stimulatory effects c. ducts; stimulatory or inhibitory effects d. neurons; stimulatory effects e. glands; inhibitory effects
The elemental and isotopic composition and species identity of a single microbial cell may be determined using
a. microautoradiography. b. flow cytometry. c. FISH-SIMS. d. single cell genomics.