Spiders breathe by means of
a. Gills
b. Diffusion across the soft cuticle
c. An extensive system of tracheae more complex than is found in insects
d. Book lungs or primitive tracheae
e. Coxal glands
Answer: e. Coxal glands
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The type of fruit that is derived from one flower with many separate carpels is a(n) fruit.
A. axillary B. aggregate C. simple D. double E. multiple
A sterile mule is produced by mating a horse and a donkey. From this observation you could conclude
A. that horses and donkeys are the same species. B. that horses and donkeys are different species. C. that mules are a result of macroevolution. D. increasing the number of mules in a population will affect the allele frequency in the next generation. E. the DNA sequences of horses and donkeys are more than 97% identical.
The source of life's diversity originates from differences in ________ .
a. DNA molecules b. sulfur backbones c. carbohydrate reservoirs d. lipid molecules e. cell wall structure
A hot, dry summer will reduce crop yields in part because
A) carbon dioxide release is reduced by the stomata closing to prevent excessive water loss. B) carbon dioxide uptake is reduced by the stomata closing to prevent excessive water loss. C) oxygen uptake is reduced by the stomata closing to prevent excessive water loss.