*Question*
Q: What can occur during periods of heavy rain? Choices: - volcanoes - glaciers - earthquakes - floods A:
**Answer**
floods

*Question*
Q: Porifera are parazoans that exhibit simple organization and lack true what? Choices: - molecules - nuclei - cell membranes - tissues A:
**Answer**
tissues

*Question*
Q: Proteins include 20 common types of what compounds? Choices: - mitochondria - rna acids - dna - amino acids A:
**Answer**
amino acids

*Question*
Q: Osteoclasts break down bone to maintain mineral what? Choices: - density - fluctuations - polarity - homeostatis A:
**Answer**
homeostatis