3. immigration to the united states in the 1800s from eastern europe is an example of which type of force for
genetic change?
a. increased birth rate
b. genetic equilibrium
c. gene flow through interbreeding
d. increased chance of genetic mutation

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?

Select the word from the list that best fits the definition apparent movement of a star used to measure its distance from earth

Which of the following is not a symptom of desertification?