Nevermind I got it now

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

What is the name of the two satelites on mars