Scientists study the composition of stars. They have recorded the four most common elements found in the stars. Star Composition
Element % of Total Mass
Hydrogen 71.0
Helium 27.1
Oxygen 0.97
Carbon 0.40

As stars age, which element will most likely decrease in mass percentage?

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms