How do humans encroach on animals territories today?

45 points how are people today being protected from tsunamis? earthquake data is analyzed to detemrine if a tsunami is likely, and if so, warnings are sent out. areas in tsunami risk zones are no longer heavily populated. radar is used to measure wave heights regularly. meteorologists study the winds to determine if wave heights will be large.

All ova contain sex chromosomes corresponding to: x y xx xy

Why has two different alleles for the same trait?