In biology, the different areas of study are connected and overlap in various ways, with concepts that cut across all disciplines. Which pair of crosscutting concepts are BEST exemplified when birds fly south when
winter comes to the United States, and north when spring arrives? Choose one.
stability and change; scale, proportion, and quantity
b. systems and system models; scale, proportion, and quantity
patterns, cause and effect
d. energy and matter: flows, cycles, and conservation; patterns
a.
c.