Permian-Triassic extinction
Because people and animals exhale carbon dioxide which plants need and they release oxygen
Answer-
All the bonds are hydrogen bonds and this bond is strong
ANSWER:
I think it's the second one.
EXPLANATION:
in primary succession newly exposed or newly formed rock is colonized by living things for the first time. in secondary succession an area that was previously occupied by living things is disturbed, then recolonizeed following the disturbance.
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The stem transports nutrients made in the leaves to all parts in the plant.
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