Biologists may study anything from the microscopic or submicroscopic view of a cell to ecosystems and the whole living planet ( Figure 1.2). This is a very broad definition because the scope of biology is vast. What is biology? In simple terms, biology is the study of life. (credit a: modification of work by NASA credit b: modification of work by Ruth Ellison scale-bar data from Matt Russell) These (b) stromatolites along the shores of Lake Thetis in Western Australia are ancient structures formed by layering cyanobacteria in shallow waters.
Figure 1.2 Formerly called blue-green algae, these (a) cyanobacteria, magnified 300x under a light microscope, are some of Earth’s oldest life forms.
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