After a major disturbance in an ecosystem, succession can restore many of the original plants and animals that lived in the habitat before the change. Which of the following is an example of primary succession? A. After a wildfire in central Florida, black bears return to the forest.

B. After a volcano on a Hawaiian island, lichens grow on the cooled lava.

C. Trees begin to grow years after crops are not produced on a farm field.

D. Following Hurricane Matthew, tropical plants grew after flooding drained.

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

Coral have a symbiotic relationship with what in order to eat?