Answer:
pollution of water. or do you mean pollutant in which case would be like garbage or oil spills
Answer:
B. The response counteracts the original stimulus.
Maybe I dont know
The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
