Which of one example of pre-existing marine life?

a. leaf imprint
b. shrimp burrow
c. dinosaur
d. bird bone

What can you increase the strength of an electromagnet by

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas