1. The leopard seals will all die from lack of food. 2. The leopard seals will all die from lack of food.
3. The zooplankton population will increase in size.
4. The phytoplankton population will increase in size.

zooplankton population will increase

Explanation:

fish eat zooplankton so without fish the zooplankton lose their predators and the population will increase. seals have other things they can eat (penguins and sea gulls), and phytoplankton will decrease because there will be more zooplankton to eat them

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explanation:

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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.