Which factor is NOT an environmental stimulus that plants respond to by means of a tropism? A. Light
B. Wind
C. Touch
D. Gravity

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?