Not sure but my best guess is to go with B. It just makes the most sense.
D. To help oxygen get into blood vessels
The hiker followed the north trail a distance of two kilometers in thirty minutes.
Answer: C) the parasite benefits, and the host is harmed; however, the host is not generally killed.
Killing the host would be bad for the parasite, as it would have no place to live.
Explanation:
<span> it goes back to the root of the words:
auto means self---------------trophic refers to feeding--so an autotroph is a self feeding organism
hetero---refers to different-------so then a heterotrophe feeds on some thing different
A...
Hope this helps ! :)
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