Biology 4 kids
Biology4 Kids: Quiz: Lichens
Take this ten-question review quiz over the hybrid organism, lichen. Read more about each question after an incorrect answer is given.
CK-12 Foundation
Ck 12: Life Science: Archaea
[Free Registration/Login may be required to access all resource tools.] For many years, archaea were classified as bacteria. Like the bacteria, archaea lacked a nucleus and membrane-bound organelles and, therefore, were prokaryotic...
CK-12 Foundation
Ck 12: Life Science: Bacteria Nutrition
[Free Registration/Login may be required to access all resource tools.] Like all organisms, bacteria need energy, and they can acquire this energy through a number of different ways. Learn more about bacteria nutrition in this learning...
Science Struck
Science Struck: Mutualism Relationships
Learn how mutualism benefits the organisms in a symbiotic relationship and what the different types of mutualism are. Provides lots of examples.