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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What are the components of nucleotides?
a. an amine group, a carboxyl, and a side chain b. a nitrogenous base, a sugar, and one or more phosphate groups c. a nitrogenous base, a carboxyl, and a side chain d. an amino, a phosphate group, and a fatty acid chain
Glycolysis depends on a continuous supply of ____
a. NADH b. pyruvate c. water d. glucose e. oxygen
In the overall reactions of photosynthesis, it appears that hydrogen atoms are transferred from water to
carbon dioxide to form a carbohydrate. This type of reaction is classified as: a. a redox reaction. b. an anaerobic reaction. c. a catabolic reaction. d. an oxidation reaction. e. a hydrolytic reaction.
Which neurotransmitter may function to regulate emotions and is involved in pathways that control complex movements?
A) dopamine B) serotonin C) norepinephrine D) synapse