A ring species is one where
a. a clinal variation occurs.
b. all of the various populations can successfully mate in nature.
c. an area's climate interferes with speciation.
d. none of the various populations can successfully mate in nature.
e. only intermediary populations can mate successfully.
E
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Why would a photosynthetic organism have more than one type of pigment within their cells?
a. To provide a backup source of energy if the main pigment type fails b. To direct light towards the primary pigment c. To optimize the amount of energy that can be harvested in specific environments d. To provide structural support for the primary pigments e. To allow photosynthesis to occur at any time of the day
The final step in the scientific method for a
scientist is
a. devising an experiment b. collecting data c. making observations d. report his or her results e. researching the literature for similar investigations
The tube feet of sea stars are used primarily for
a. excretion of excess water. b. locomotion. c. reproduction. d. circulation. e. sensation
How are clades different from traditional Linnaean taxonomic groups?
a) clades contradict classification by kingdoms b) clades group organisms by visible similarities only c) clades make comparisons of organisms gene by gene d) clades focus on derived characters