Which of the following characters was not an ancestral trait that facilitated the colonization of land by an animal group?
a. Amniotic egg
b. Exoskeleton of arthropods
c. Lungs
d. Vertebrate skeleton
e. Arthropod cuticle
Answer: a. Amniotic egg
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Stramenopiles are unique in that they possess:
A. double plastids B. hairy flagella C. alveoli D. flexible protein ribbons beneath the plasma membrane E. calcium carbonate crystals
Human society in its current form is unsustainable because
A. diverting agricultural yield for feeding livestock supplies enough protein to fulfill a community's dietary needs. B. recycling has eliminated the need for the mining of some mineral resources. C. renewable energy sources are consuming land and resources more quickly than they can be replenished. D. freshwater is being effectively preserved through conservation. E. important natural resources are being consumed more quickly than they can be replenished.
Lois plans to set up a freshwater aquarium. How might she add oxygen to the system for the fish to use during respiration?
A) Make sure the aquarium receives enough sunlight so that the water molecules can be split. B) Add soil and sand as bottom substrate that will release stored oxygen. C) Add plants that produce oxygen during photosynthesis. D) Add snails to the aquarium to decompose material that adds oxygen to the system.
Viruses that infect bacteria are specifically called ________.
Fill in the blank(s) with the appropriate word(s).