Prokaryotes are very important ecologically because of their involvement in all of the following except
A. photosynthesis.
B. nitrogen fixation.
C. STDs.
D. denitrification.
E. bioremediation.
C. STDs.
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In sponges, spicules are ____
a. fibrous skeletal proteins b. specialized digestive cells c. complicated pore openings and passageways d. needle like skeletal structures made up of silica or calcium carbonate e. feeding cells with a flagellum surrounded by a collar
The largest cones produced on a pine tree, the ones we are typically most familiar with, are the female
cones that contain:a. megasporangia. b. microsporangia. c. pollen. d. microspores. e. antheridia
Which of the following will not prevent the further buildup of greenhouse gases?
a. Plant a tree or, better yet, plant many trees. b. Use your automobile less, and ride a bicycle more. c. Produce less waste that goes to landfills. d. Buy an air conditioner that uses chlorofluorocarbons. e. Buy an automobile that is more fuel-efficient.
Older roots can become extremely thick and woody as ________ accumulates during secondary growth.
A. Secondary phloem B. Sapwood C. Primary xylem D. Secondary xylem E. Primary phloem