1 A paramecum is a single-celled organism that needs to ingest food in order to (1) release oxygen into the air
O get the energy they need to carry their metabolism
(3) prateer themselves from predators
(4) adapt to chemicals in the environment

50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b.compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength