Aclass is trying to the time it takes for people to react. one student holds a meter stick between the fingers of another student. the student holding the meter stick releases and the other student is told to close their fingers as soon as they see the meter stick closed. the distance the meter stick falls before being caught is measured and a time of reaction is calculated. since, there will be some difference between the reaction times of students, the average of all the results is found. clearly, a natural variation is impossible to eliminate. however, some steps can be taken to improve the reliability of the results. which of these might reduce the variability of the data? a. have each student do multiple trials. b. time the reaction as opposed to measuring the distance and calculating a time. c. ensure that the finger separation is constant. d. ensure that everyone drops the meter stick from the same height. e. average all distances before calculating a reaction time. f. measure the distance to the same precision for every student.

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law

To take a whiff of your favorite food, you use both? a. motor nerves and your digestive system b. sensory nerves and your immune system c. motor nerves and your skeletal system d. sensory nerves and your respiratory system