Two species of birds compete for the same size of seed eventually develop different beak sizes that allow them to compete for different sizes of seeds. What has occurred?
a. competitive exclusion only
b. character displacement only
c. directional selection only
d. competitive exclusion and character displacement
e. directional selection and character displacement
e
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The largest group and most important marine photosynthetic organisms are:
a. kelp. b. seagrasses. c. macroalgae. d. phytoplankton. e. giant kelps.
A newborn baby dies soon after birth because her diaphragm and rib cage muscles failed to contract and she was unable to breathe on her own. Examination of the baby’s DNA revealed that she had a genetic mutation in a gene that encoded a calcium-binding protein. Which protein was most likely defective in the baby?
A. actin B. myosin C. acetylcholine D. tropomyosin E. troponin Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the proteins the bind to calcium in a muscle contraction? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Reef-building corals contain endosymbiotic _____ which provide a major portion of the coral’s nutrition
1.Sporozoans 2.Dinoflagellates 3.Euglenoids 4.Ciliates
Which system functions to maintain blood volume and composition?
a. endocrine b. circulatory c. respiratory d. lymphatic e. urinary