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remove starch from the leaves of a plant by preventing photosynthesis from occurring (for a few days).
the main force responsible for the upwards movement of water in the xylem.
water that falls to earth in any form, such as rain, snow, hail and sleet.
(also called heterotrophic organisms) organisms that are not able to produce their own organic...
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
substances that have a harmful effect on the environment and also on human health.