The history of life has been punctuated by several mass extinctions. for example, the impact of a meteorite may have wiped out most of the dinosaurs and many forms of marine life at the end of the cretaceous period (see chapter 23). fossils indicate that plants were less severely affected by this mass extinction. what adaptations may have enabled plants to withstand this disaster better than animals?

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.