Which organisms are the most abundant primary producers in earth's oceans?

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

In which terrestrial biome can you find trees that produce cones instead of flowers and needles instead of leaves? have trees that produce cones instead of flowers and needles instead of leaves. the latitudes in this biome have evenly distributed precipitation throughout the year. is it high or low