The continental crust is than the oceanic crust and seems to "float" on the mantle.
a) thinner
b) younger
c) less dense
d) mostly basalt
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i think its c. amphipod

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.