Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters