18. how might you control variables
in an experiment about landscaping
techniques?
critical thinking
19. explain how you can reduce, reuse,
and recycle to avoid wasting plastic
shopping bags.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

i think the answer would be a. after sentence 14! i hope i at least a little