The tracheae of adult terrestrial insects have been a factor in the great abundance of insects because they serve the same function in terms of the delivery of respiratory gases to the cells as do
A. the gills of aquatic insects.
B. the lungs of mammals.
C. the book lungs of spiders.
D. the closed circulatory system of cephalopods.
E. the Malpighian tubules of spiders.
D. the closed circulatory system of cephalopods.
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Metagenomics offers a DNA-based method to understand
A. the history of species diversity. B. microbial stability C. microbial diversity. D. the organismic model of communities. E. the Shannon Diversity Index.
The range of the grizzly bear in the 48 contiguous United States is now less than 1% of what it was in 1800. What has been proposed to help maintain genetic variation in the remaining populations of this species?
A. protected corridors between all of the remaining populations B. regular exchange of bears between isolated populations C. proserving more small patches of forest D. cloning of the most genetically diverse remaining females E. establishment of new parks in Colorado and New Mexico
The ____ absorb nutrients through their plasma membranes and lack food vacuoles
a. golden algae b. apicomplexans c. dinoflagellates d. diatoms e. red algae
Many cultures in the world do not eat meat as a primary protein source. Often we find dishes of rice and beans (e.g., rice and black beans, rice and tofu, rice and lentils) in the diet of these cultures. Explain why these combinations of foods are found
What will be an ideal response?