Question 15 of 20:
select the best answer for the question
15. fish respiratory systems exchange gas and receive oxygen at the gills. this oxygen then enters the
blood stream and is pumped through the heart and back through the gills without first returning to the
heart. this order of events best describes which type of circulation system?
o a. single loop
ob. open
c. recycling
od. double loop

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

The endoplasmic reticulum (er) is an organelle in some cells. in these cells, it is continuous with the nuclear membrane and forms a large part of the cell\'s total membrane. sort the phrases below as describing rough er, smooth er, both, or neither. note: if you answer any part of this question incorrectly, a single red x will appear indicating that one or more of the phrases are sorted incorrectly.1) found in prokaryites and uekaryotys2) involved in protein synthesis3) involve in lipid synthesis4) contains molecular chaperones in lumen5) bound with ribosomes6) involved in toxin or drug metabolism7) large systemot internnected tubules,vesicles, and sacs8) "packages" enzymes in vesicles for secretion.

What noticeable trend from this graph might be used to make a conclusion?