The fact that there is always variation within a species can make it difficult to classify fossils. how similar do two specimens have to be to classify them in the same species? there are two different hominin discoveries discussed in this chapter where a newly discovered species was mistaken for modern humans with skeleton-altering diseases. do you remember which ones?

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.