Nutrient cycling through ecosystems can be depicted using a(n) ____
Fill in the blank with the appropriate word.
food web
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Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic B. Homeotic, Gap, Bicoid C. Homeotic, Bicoid , Gap D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order. E. Kruppel, gooseberry, even-skipped
__________ in annelids regulate the composition of body fluid. Fill in the blank(s) with the appropriate word(s)
The Law of Thermodynamics that states that energy cannot be created or destroyed is:
A. The Fourth Law of Thermodynamics B. The Second Law of Thermodynamics C. The First Law of Thermodynamics D. The Third Law of Thermodynamics
Allopatry occurs when _________________.
a) populations become separated geographically. b) populations exchange alleles by migration. c) populations become two separate species. d) populations go extinct.