Almost all cacti are native to the Americas, but there is a small, relatively uncommon group of plants closely related to cacti native to tropical western Africa. How can we explain this given the information in this chapter?
A) The plants might have floated across the Atlantic.
B) This might have been caused by divergent evolution.
C) The continents were once connected.
D) All of the above are true.
C
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In the streak plate method, what is the best way to ensure that the loop is cool, after it has been flamed?
A) Touch the loop to your finger to determine the temperature B) Touch the loop to an uninoculated area of the plate C) Touch the loop to an inoculated area of the plate
A method used to link genetic markers with specific genes on chromosomes is called _____________. Fill in the blank(s) with the appropriate word(s)
The two main divisions of the skeletal system are:
A) cranial and axial. B) vertebral and appendicular. C) appendicular and cranial. D) appendicular and axial. E) axial and articular.
You are doing biology field work studying two species of lizards on a small volcanic island. Although quite hostile to each other when they accidentally meet, the two species usually remain in separate parts of the island. Species A seems to live and
hunt insects only in the lower grassland part of the island. Species B seems to live and hunt only in the upper rocky areas. Species A has a short tongue but has longer legs and is a faster runner. Species B is short, squat, runs slower, but has a long tongue. You observe Species A chasing down some pretty large, fast-moving insects, while Species B meanders from rock to rock, using its long tongue to get insects hiding between rocks and in cracks. What principle of ecology do your two lizard species demonstrate? A) coexistence B) resource partitioning C) competitive exclusion D) convergent evolution