Hagfish, lampreys, and sharks and rays have cartilaginous endoskeletons. Did the first vertebrates have endoskeletons consisting of cartilage or bone?.

Chicken pox and hepatitis are bacterial diseases. true or false?

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.

Physical characteristics of down syndrome