In the reflex arc what is the function of the afferent fiber ?
1.to carry signal from the integration center out to the effector, so the effector can respond appropriately
2. to carry the signal from the receptor to the integration center for processing
3. it detects change
4. none of the above

What is the ecological role of food chains and food webs

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.

What is the starting point in replication called