Why is spotted knapweed not cause the same damage to its native ecosystem?
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Ответ:
Why is Spotted knapweed a problem in the Great Basin? Spotted knapweed creates dense stands that crowd out more beneficial species.
Explanation:
A large, perennial taproot helps spotted knapweed survive fires. It also produces large quantities of seed that can thrive without competition from other plants following fire.
Ответ:
The pigment that causes leaves to be green is chlorophyll. ... As chlorophyll goes away, other pigments start to show their colors. This is why leaves turn yellow or red in fall. In fall, plants break down and reabsorb chlorophyll, letting the colors of other pigments show through.