Read each example and decide what the resulting effect on the gene pool of that population would be.

1. a zebra migrates to join a different herd of zebras.
2. competition for sunlight leads to taller trees.
3. the dna of a snake changes to make its venom stronger.
4. a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

then it only gives 4 options for 4 questions.

option 1. create new alleles from dna
option 2. brings new alleles from new populations
option 3. randomly selects alleles
option 4. favors certain alleles

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

whats the answer to your question?

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .