Thousands of years ago in a land far away, plate tectonics created a mountain range that separates a population of red parrots. on the east side of the mountain, the recessive trait of blue feathers was selected for because it the parrots avoid predators. however; on the west side of the mountain the parrots kept the trait of red feathers. one day, to escape a storm, a small number of blue parrots migrated to the west side of the mountain where the red parrots dwell. identify and explain the evolutionary mechanism at work in this scenario, then predict how the populations of parrots will be affected by the migration.

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Complete the sentences by matching the names of trees to the appropriate blanks. to do this, drag the names on the left into the appropriate blanks in the sentences on the right. match the words in the left column to the appropriate blanks in the sentences on the right. terms may be used more than once. make certain you have filled every blank with a term before clicking submit. 1. deciduous trees lose their leaves seasonally and include trees such as maple and elm. 2. conifer leaves are generally thin and needle-like, while seeds are contained in cones. conifers include cedar and pine. 3. evergreens are plants that maintain their leaves in all seasons and include trees such as cedar, elm, and pine. 4. hardwoods reproduce using flowers and have broad leaves; hardwoods include trees such as maple, , and cedar. elm returned you filled in 2 of 10 blanks incorrectly. mango trees are tropical broad leaf plants that maintain their leaves all year long. no credit lost. try again.

Explain why biological control methods are generally environmentally superior to chemical pest control methods.