All different species living together in the world make up what?

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Which of these best describes what occurs during cytokinesis? a) the chromosomes are separated b) the cell begins to divide by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm