In which kind of solution is the concentration of solutes the same inside and outside of the cell?
-isotonic
-hypertonic
-hypotonic
-concentrated

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.