When you observe a lake that has been affected by acid deposition, you might expect to find
A) low levels of toxic metals and nutrients essential for the growth of biotic organisms.
B) excess carbon that will contribute to global warming.
C) high levels of dissolved sulfur dioxide.
D) a clear lake with high levels of aluminum, mercury, and lead, but few fish.
E) a murky lake with excess algal growth from the deposition of anthropogenic nitrogen.
D
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A true predator is a species that
A) feeds upon any part of any organism, not necessarily killing it. B) feeds only on animals. C) kills its prey more or less immediately upon capture. D) feeds on dead or living prey.
Which event and date is mismatched?
A. origin of eukaryotic cells-2.2 billion years ago B. origin of life-4.8 billion years ago C. origin of multicellular organisms-650 million years ago D. All the choices are incorrect.
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. many ancestral bird species colonized each island. B. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations. C. each bird species evolved different adaptations in allopatry and then colonized the other islands. D. one bird species colonized each island and then evolved into distinct species on that island through character displacement.
Ribosomes are the sites of ________ and are composed of rRNA and _________
Fill in the blank(s) with the appropriate word(s).