What structure prevents reflux of stomach contents?

The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community

Which term describes a normal value for something in the body? a. homeostasis b. set point c. feedback loop d. integration center

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above