Which of the following statements concerning euglenoids is FALSE?
a. They have a pellicle.
b. They have 9 + 2 arrangement of microtubules in their flagella.
c. Their cells contain mitochondria.
d. They are unicellular.
e. They are all photosynthetic.
A
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Eutherian mammals are uniquely defined by:
A. having a placenta B. longer gestation periods because of more highly developed placentas C. having fur D. the young developing in a pouch E. laying eggs
An American nurse returning from serving in a hospital in the Congo experienced chills, fever, and sweats. The fever cycle peaked about every 48 hours. Which of the following is a likely diagnosis?
A. African sleeping sickness B. Malaria C. Leishmaniasis D. Histoplasmosis
Which factor has the greatest effect on the
amount of incoming light that strikes an area? a. latitude b. temperature c. humidity d. the ozone layer e. wind pattern
The deciduous forest of eastern North America has experienced dramatic changes over the past two to three centuries, transitioning from a nearly continuous forested area to increasingly patchy areas of forest broken up by farming and development
Some species are more sensitive to severe habitat fragmentation than others. What are some characteristics that might make a species more susceptible to the effects of habitat and population fragmentation?