What did Darwin hope to learn about artificial selection by studying pigeons?

The process of meiosis produces only gametes, eggs or sperm. according to the diagram, how many sperm are formed from each cell that undergoes meiosis?

Which statement best explains the difference between weather and climate? the weather of an area is the same as its climate. the weather is the climate of an area over a period of time. the climate of an area depends on the weather. the climate is the weather patterns over a long period of time

Acid rain throughout the northeast united states has lowered the ph of many ponds and lakes. the lowered ph will eventually result in the death of many aquatic animals. compare the map of the u.s. with the ph tolerance range for the organisms listed. based on the tolerances seen here, which aquatic organisms are least likely to survive in the northeastern states?