Agroup of students is investigating whether the force of friction depends on the nature of the surfaces in contact. the students push two pieces of wood each with the same force on a table. one piece of wood is smooth and the other is rough. the distance traveled by each piece of wood is shown. experimental observations student 1 student 2 student 3 student 4 distance traveled by smooth piece of wood 20 cm 18 cm 16 cm 19 cm distance traveled by rough piece of wood 15 cm 12 cm 10 cm 11 cm what was the outcome variable (dependent variable) in this experiment? distance traveled smooth wood rough wood number of students

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.