#Question id: 5027
#Unit 11. Evolution and Behavior
Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?
1. Protostomes invade terrestrial environments.
2. Cambrian explosion occurs.
3. Deuterostomes invade terrestrial environments.
4. Vertebrates become top predators in the seas.
#Question id: 23989
#General Aptitude
#Question id: 27487
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 744
#Unit 1. Molecules and their Interaction Relevant to Biology
In a DNA molecule, deoxyribonucleotides are joined into a polymer by the covalent linkage of a phosphate group. The covalent link termed as:
#Question id: 23671
#Unit 13. Methods in Biology