If an oxygen atom has 8 electrons (2 in the 1st energy shell and 6 in the 2nd energy shell) how many bonds can it form

Pl which diagram illustrates prophase?

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.

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?