#Question id: 2259
#2. Cellular Organization
Which of the following is not a characteristic of prokaryotes?
#Question id: 1041
#4. Cell Communication and Cell Signaling
The lactobacilli, in their role as normal flora of the vagina, help the vagina resist infection by contributing to
#Question id: 5028
#11. Evolution and Behavior
What is the probable sequence in which the following clades of animals originated, from earliest to most recent?
1. tetrapods
2. vertebrates
3. deuterostomes
4. amniotes
5. bilaterians
#Question id: 19693
#13. Methods in Biology
#Question id: 9178
#9. Diversity of Life Forms
A fish swimming into an estuary from a river would have which of the following as its greatest physiological challenge?