Some lizards have different size legs. Lizards with longer legs are able to better access food. Overtime Lizards with short legs became less common.
What is the inherited variation?
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Genetic variation is the difference in DNA among individuals or the differences between populations. There are multiple sources of genetic variation, including mutation and genetic recombination.

Explanation:

The length of a lizard's legs does not have anything to do of how long of a distance it can travel.  

It does however effect how fast a lizard can get to a certain distance.

Longer legged lizards will have longer strides that can cover more ground per stride. Therefore, they can get to a certain distance sooner than a short legged lizard could

Explanation:

b. the carbon cycle ensures living things have a source of hydrogen

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.