How can hydrotropism cause problems? A: Plants will absorb most of the water from the source.
B: Plants can grow near water sources preventing access to other organisms.
C: In cities, plants can grow in drainpipes causing it to back up.
D: Plants can cause water to become polluted.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.