How do unicellular and multicellular organisms compare and meeting their needs to stay alive

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f