Which of the following is not an ecosystem service?
1.carbon dioxide production
2.decomposition of wastes
3.nutrient recycling
4.oxygen production
5.purification of air and water
1
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Which of the following is the best definition of
sympatric speciation? a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. evolutionary change that creates two species occupying the same space
The use of _____ is associated with an increased risk of transmitting genetic defects, such as those related to
infertility, onto male children. a. IVF b. GIFT c. IUI d. ZIFT e. ICSI
Which pair demonstrates a mutualistic relationship?
a. orchid and its host b. rhizobia and strawberry plants c. soil fungus and soil bacteria d. mistletoe and its host e. mychorrhizae and roots
The toxin of Vibrio cholerae causes profuse diarrhea because it _____
A) modifies a G protein involved in regulating salt and water secretion B) binds with adenylyl cyclase and triggers the formation of cAMP C) signals IP3 to act as a second messenger for the release of calcium D) modifies calmodulin and activates a cascade of protein kinases