You’ve made the hypothesis that the steeper the slope the faster a ball will be rolling when it reaches the bottom. what should be your independent variable in an experiment testing this hypothesis a)how tall the slope is b)how steep the slope c)how fast the ball is rolling at the top d)how fast the ball is rolling at the bottom

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Which system sends messages to organs and tissues?