Comets are examples of bodies that complete parabolic or ___ orbits.

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

What is any method of measuring the age of an object or event in years, such as using atomic half-life?

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?