: single-celled photosynthetic bacteria : mass of stone or metal that has passed through the atmosphere and struck the earth's surface : mass of stone or metal traveling through space : a molecule composed of three oxygen atoms; absorbs UV radiation : process by which plants use chlorophyll and energy from sunlight to manufacture food from carbon dioxide : the process by which oxygen combines with food to release energy and carbon dioxidea. photosynthesisb. respirationc. meteorite d. cyanobacteria e. meteoroid f. ozone

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian