Predict the next digestive system organ in the following sequence:

mouth, pharynx, esophagus, stomach,

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

What did hunter gathers do to alter the environment?

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad