Oil spills into rivers, bays, and the ocean most often are caused by accidents involving tankers, barges, pipelines, refineries, drilling rigs, and storage facilities. Spills can be caused by: people making mistakes or being careless.
The REM, or Rapid Eye Movement phase, which is crucial to fostering creativity, improving the quality of sleep, and allows for the creation of long-term memories.
The correct answer for the question that is being presented above is this one: "d. amount of plankton." The key abiotic factor in marin ecosystems includes the water temperature, the amount of sunlight and the water depth. The amount of plankton is not really an issue.
Normal cells stop growing (reproducing) when enough cells are present. For example, if cells are being produced to repair a cut in the skin, new cells are no longer produced when there are enough cells present to fill the hole (when the repair work is done).
In contrast, cancer cells don’t stop growing when there are enough cells present. This continued growth often results in a tumor (a cluster of cancer cells) being formed.