Most of the Earth's oxygen occurs in the form of minerals in the crust and mantle. The oxygen that is available in the atmosphere is used primarily by plants, animals, and bacteria to perform cellular respiration.
Why is running out of oxygen still not a real concern?

A. Oxygen is recycled through the interrelated processes of photosynthesis and cellular respiration.
OB. Oxygen can easily be mined from rocks and sand and then be released into the atmosphere.
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OC. The Sun creates more than enough new oxygen atoms in the atmosphere by splitting phosphate molecules.
OD. Lightning creates large quantities of ozone, which quickly breaks down into oxygen molecules.
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Why should the united state be concerned about air pollution in china?

What do scientists need to look at before developing an argument

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.