Two groups of shrimp are considered by scientists to be sympatric. Which must be true of these two groups?

Some barrier to reproduction exists between individuals of the two groups.
Food resources must be the same between the groups.
Neither group will show a change in change in gene frequency over time.
Neither group is subject to natural selection.
The two groups must mate at the same time of year.

Question

Two groups of shrimp are considered by scientists to be sympatric. Which must be true of these two groups?
 	
	Some barrier to reproduction exists between individuals of the two groups.
	Food resources must be the same between the groups.
	Neither group will show a change in change in gene frequency over time.
	Neither group is subject to natural selection.
	The two groups must mate at the same time of year.

anonymous · Answer

this one im not sure of @ananata

aaronq · Answer

what does "sympatric" mean? @gigipopper

anonymous · Answer

(Science: ecology, zoology) refers to different species or populations of the same species that livein the same geographic area.

Compare: allopatric.

aaronq · Answer

I would say 

	Food resources must be the same between the groups.

aaronq · Answer

@gigipopper