If plants did not produce vascular tissue they would be limited to a few millimeters in height
A. true
B. false
A
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The pace of evolution does not always occur at a constant rate but is periodically interrupted by rapid bursts of speciation; this is known as ________.
What will be an ideal response?
In humans, ventilation is powered by the
1.diaphragm only. 2.muscles attached to the ribs only. 3.lungs, themselves. 4.diaphragm and rib muscles. 5.all of the choices
Given that humans shifted from hunter-gathers to an agriculturally based society within the last 10,000 years does NOT mean that ________
A) we cannot expect evolution by natural selection in human populations to have kept pace with our changing way of life B) humans still retain many, if not most, of the features that made us well adapted to living in the hunter-gatherer societies of the stone age C) we can use knowledge of the differences between our current lifestyle and the lifestyle of our pre-agricultural lifestyle to better understand both the peculiarities of humans and risks associated with our modern lifestyle D) humans are unique in that we have the capacity evolve by natural selection much more rapidly in response to changes in our environment than other organisms do
Which of the following is NOT a possible scenario resulting from genetic engineering?
Genetically engineered cattle grow faster than unmodified cattle. Genetically engineered corn remains untouched in one field, while insects attack wild corn. Genetically engineered herbicide-resistant rice provides more vitamins than wild rice. Genetically engineered salmon escape from their pens and outcompete native salmon. Genetically engineered salmon reach market size significantly faster than is normally the case.