Which organism is an endotherm?
A) a mouse
B) an insect
C) a salmon
D) a frog
A
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The broad base at the primary producer level in a trophic pyramid is due to all of the following except:
A. the greatest availability of energy. B. the greatest amount of biomass. C. the relatively higher number of primary producers compared with organisms at other levels. D. the amount of oxygen given off at this level. E. the larger body size of primary producers compared with organisms at other levels.
What is wood?
a. primary xylem b. secondary xylem c. secondary phloem d. cork and cork cambium e. periderm
A cellular structure found in plant but not animal cells is the:a
chloroplast. b. ribosome. c. endoplasmic reticulum. d. microtubule. e. microfilament.
A phycologist studies which of the following?
a. classi?cation of eukaryotes b. alternation of generations in algae c. rusts, smuts, and yeasts d. parasitic worms