What criteria are used to correlate rock units in different areas? What will be an ideal response?

Sympatric speciation occurs where populations are geographically isolated and gene flow between the populations does not take place.

a. true b. false

Planetary geology focuses only on those planets with a rocky surface such as Venus and Mars

Indicate whether this statement is true or false.

Delta shape varies depending on current activity, waves, and vegetation.

a. true b. false

Standing freshwater is called a lotic system.

Answer the following statement true (T) or false (F)