The (definitive/intermediate/primary) host is where immature stages of parasites develop.
Fill in the blank(s) with the appropriate word(s).
intermediate
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. During what season would you expect oxygen levels to be lowest in a single year?
A. summer B. fall C. winter D. spring
The sporophyte stage of red algae produces spores that are shed into the water. What is the advantage of shedding spores into the water?
What will be an ideal response?
Xylem transports water and dissolved nutrient minerals in which direction?
a. upward b. downward c. inward laterally d. outward laterally e. both upward and downward
What feature of a dinosaur determines whether it is a saurischian or an ornithischian dinosaur?
a. size b. habitat c. feeding preference d. pelvic bone structure e. number of feet it walks on