1) the age at which children understand abstract concepts
2) how conflict affects marital happiness
3) brain development during adolescence
4) which psychological test would best predict job success

In some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. the production of sterile male ligers is an example of read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. the production of sterile male ligers is an example of a postzygotic barrier the founder effect sympatric speciation a prezygotic barrier

Match the following items. 1. free enterprise system 2. mixed economy 3. the former soviet union 4. land and capital (a) private and state ownership of business (b) factors of production (c) private ownership of capital (d) command economy

What event was one of the greatest factors that led to massive emigration from ireland to the united states in the mid—1800s