This article was originally published with the title “ The Circulatory System of Plants ” in Scientific American Magazine Vol. 200 No. 2 (February 1959), p. 44 doi:10.1038 ...

PRESENTER:'Ella has P.E. today, and her circulatory system is going to have some exceptional ... Zoe asks a group of children to perform a heart rate experiment, taking their own pulses.

The circulatory system The circulatory system is the heart ... Investigating the rate of photosynthesis Try this experiment and use pondweed to see how light intensity affects the rate of ...