There is an outbreak of a bacterial disease that is causing millions of humans to die daily. Bacteria have become resistant to these antibiotics and this can happen very quickly since bacteria can produce several generations within one day. Explain what is happening to the population of bacteria that are not resistant to the antibiotics and what is happening to the population of bacteria that are resistant to the antibiotic. Explain why this is occurring.

Which of these resources is used worldwide to make construction products, pottery, and porcelain

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase

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.