Describe the symbiotic relationships of tube-dwelling and burrowing worms
What will be an ideal response?
Those species that are not carnivorous provide a protected and ventilated home for many commensal organisms. There are commensal polychaetes that live with other animals, often using color camouflage to hide themselves.
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Red tide and extensive fish kills are caused by population blooms of
a. euglenoids. b. dinoflagellates. c. diatoms. d. ciliates. e. brown algae.
A mutualistic symbiosis where fungal hyphae grow between and around plant roots but do not
penetrate plant root cells is called a(n) ____.
a. ectomycorrhiza b. lichen c. arbuscule d. endomycorrhiza e. haustorium
An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. B) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy. C) Without this treatment, the mother's immune system will attack only her own blood cells. D) Without this treatment, antibodies will be formed in breast milk, which could harm the baby.
In the open-water region of freshwater lakes, the ________ zone lacks sufficient light for photosynthetic organisms
Fill in the blank(s) with correct word