A) A group of same aged young which grow and survive at different rates
B) A group of different aged young which grow and survive at similar rates
C) A number of individuals alive in different age classes
D) A group of same aged young which grow and survive at similar rates
E) A graphical representation of the numbers of individuals alive at various ages

A) Butterfly
B) Annual plant
C) Elephant
D) American robin
E) Barnacle

A) The number alive at the start of a time period
B) The number dying during a time period
C) The proportion dying during a time period
D) The proportion surviving during a time period
E) Life expectancy