T or F? The stiffness of a material can be determined by calculating the slope of the plastic portion of the stress-strain curve.
What will be an ideal response?
False
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Tight junctions ____
a. seal the spaces between cells
b. allow ions and small molecules to pass between cells c. allow cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall
Based on the above diagram and other information from your text, what is the most likely (e.g., most parsimonious) explanation for the evolution of flight in vertebrates?
A. Wings evolved once in vertebrates (e.g., the common ancestor of all terrestrial vertebrates had wings), and wings were subsequently lost in all but three lineages: bats, pterosaurs, and birds. B. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in pterosaurs and in the common ancestor of birds and dinosaurs. C. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently two different times: once in bats and once in the common ancestor of birds, pterosaurs, and dinosaurs. D. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in pterosaurs, and in birds. E. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in birds and in the common ancestor of pterosaurs and dinosaurs.
Riverine wetlands usually have a longer hydroperiod than basin wetlands
Indicate whether the statement is true or false
Which reproductive isolation mechanism is defined by the prevention of genetic exchange between two species because
they reproduce at different times of the day or year? a. diurnal isolation b. sexual isolation c. annual isolation d. temporal isolation e. mechanical isolation