Why are plants so important to ecosystems?

describe an ecosystem and identify the different trophic levels.

describe what happens to energy as it is transferred through an ecosystem.

explain what happens in the carbon cycle, giving specific examples of some of the steps.

compare and contrast photosynthesis and cellular respiration.

What happens to the light rays when they hit the specimen?

What happens when chlorine reacts with bromine? a. electrons move from the chlorine atoms to the bromine atoms. b. electrons move from the bromine atoms to the chlorine atoms. c. electrons are shared between the chlorine atoms and the bromine atoms. d. electrons become delocalized among the atoms.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.