The la brea tar pits are
a. a valuable source of petroleum
b. filled with tar made from mammals
c. filled with asphalt
d. a and b only

The La Brea Tar Pits are filled with asphalt. They are a group of tar pits. There is natural asphalt that has seeped up from the ground for tens of thousands of years. This is where many remains of prehistoric creatures were found. This animals got stuck in this pools of asphalt.

C. Filled with asphalt

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explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.