Plant cell needs cell wall whereas animal cell do not because the plants need rigid structure so that they can grow up and out . All cells have cell membranes, and the membranes are flexible. So animal cells can have various shapes, but plant cells only have the shapes of their cell walls.
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some stuff you can just look up on goigle my dude
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Populations have variation in traits due to random mutation, crossing over and environmental conditions.
Hello!
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The answer to your question is "asthma".
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In its earliest medical application, the herb from which amphetamines are derived was used as a treatment for asthma.
:)
