The gametes formed by meiosis undergo two rounds of cell division. In the first round of meiosis, DNA is replicated prior to cell division as it is in mitosis. However, in the second round of meiosis, replication does not occur prior to cell division. What is the significance of this difference between the first and second rounds of meiosis to sexual reproduction?

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .