Question

Variations within a species are an important part of Charles Darwin's theory of evolution. Which example can be explained by individual variation?
The food source in a lake is not enough to support the bass population, but it can support the trout.
A population of brown bears has doubled in the past 10 years.
Owls and foxes compete fiercely against each other for small rodents in their habitat.
Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.

Answer 1

Pretty sure it's Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.
Individual variations are the differences that vary from one individual to another in the same species of living organisms.

Answer 2

I'm also taking the same test :) good luck! hope that helped.

Answer 3

think of homo sapiens
some of us are heavily-pigmented than others, whilst tall and some are shorter
these are what we consider individual variation - differences in characteristics that occur within the same species

don't forget your taxonomic rank
Damian, Kingdom, Phylum, Class, Order, Family, Genus, Species

Answer 4

hey you still on?

Answer 5

Well, giraffes with longer necks survived.
Therefore, I deduce that the cardinal answer is correct.

Additional support to my reasoning is found within the question:

Quote from question | Quote from Answer
Variation = Bright Cardinals vs Dark
Darwin's theory = Better able to survive and to reproduce

Answer 6

^In case you wanted to see the invisible assumptions behind the answer^

Answer 7

thanks guys