The first aerobic organisms could live in the presence of oxygen without harm because they evolved ____
a. chloroplasts
b. pigments
c. hexokinase
d. mitochondria
e. antioxidants
e
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Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. each bird species evolved different adaptations in allopatry and then colonized the other islands. B. one bird species colonized each island and then evolved into distinct species on that island through character displacement. C. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations. D. many ancestral bird species colonized each island. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about adaptive radiation? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
The electrochemical gradient that determines how a charged ion will move through a permeable membrane depends upon
A. the electrical forces acting on that ion. B. the difference in concentration of that ion on either side of the membrane. C. the ratio between the charge on the ion and its atomic mass. D. the combined effects of electrical forces and concentration differences across the membrane. E. All of the choices for this question are correct.
RNA is significantly less stable than DNA. Based on the structural differences between these molecules, what is a
plausible hypothesis as to why this is?
What will be an ideal response?An eating disorder of underconsumption that results in health-threatening weight loss
What will be an ideal response?