Which of these statements is true? a. some molecules may contain no atoms. b. some elements found in nature exist as molecules. c. some compounds include only one type of element. d. some atoms are made of two or more different elements.

Why are people not able to scuba dive in the deep part of the ocean

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

What is the percent by mass of oxygen in fe2o3