Why are saprotrophs so important to a marine food web? they break down dead organisms and recycle nutrients. they directly to maintain the population sizes of different predators. they primarily eliminate toxins from the water that can harm phytoplankton. they produce significant amounts of energy that is used by top consumers.

They break down dead organisms and recycle nutrients.  

Explanation:

Saprophytes are the living organisms which feed upon dead organisms such as plants, animals and their decaying products. They contribute to the food web because they help in clearing up the biological waste from the environment and makes the resources after degradation available to the plants as soil nutrients. Therefore, helps in the nutrient recycling in an ecosystem.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.