Which of the following is a property of a pure substance? (5 points) Select one:
a. It consists of different types of compounds.
b. It may have substances in different states of matter.
c. The ratio of the particles that make it up is fixed.
d. Its components can be separated by employing physical methods

Explain why scientists use shared characteristics to make cladograms.

Convert .347 kilometers to miles show your work

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium