Which is a weakness of traditional food webs when they are applied to complex ecological problems?

a) a food web does not represent all the links in an actual ecosystem.
b) food webs do not account for non-native species in the environment.
c) the many food chains of a food web make it too complicated to use.
d) trophic levels are not taken into account when creating a food web.

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try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

the answer is sex-linked recessive.