The transition between wakefulness and sleep is marked by the appearance of waves in the sleep record.

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.

Models are non-visual ways of coummincating how someone thinks about something in the natural world