He determined experimentally that seeds of land plants were able to survive prolonged immersion in salt water from which he could argue how far a viable seed might be transported by ocean currents He

What did Darwin determine about the survival of land plant seeds in saltwater?; seeds can survive immersion. What are some examples of how Darwin argued viable seeds may be transported by ocean currents?; floating tree stumps, mud on birds' feet, seeds in bird crops, icebergs carrying fragments. How do freshwater animals disperse?; attach to ducks' feet. What is unique about the biology of the Galapagos Archipelago?; contains numerous unique species. What did Darwin realize about the unique species on the Galapagos?; they were closely related to mainland species. What was missing from the animal and plant life on oceanic islands?; mammals and trees. What marked other oceanic islands besides the Galapagos?; peculiarities in animal and plant life. Why was the theory of creation unable to explain the peculiarities of island life?; anomalies could not be explained. What was Darwin's theory on how the inhabitants of oceanic islands originated?; drawn from neighboring mainland. What was the great merit of oceanic islands for Darwin's argument?; simplicity of environmental relationship. Why is the evolutionary fate of a group of organisms on oceanic islands easier to predict than on a fully occupied land?; less complex competitive pressure. What is the determinate nature of evolution on oceanic islands?; its direction is predictable. What did Darwin's experiments on freshwater snails show?; they can attach themselves to ducks' feet. What was Darwin's view on the biology of the Galapagos Archipelago?; suggestive of evolutionary views. What were Darwin's thoughts on the first appearance of new beings on Earth while on the Galapagos?; brought closer to the fact. How were the unique species on the Galapagos related to mainland species?; they were closely related. What did Darwin mix together that led him to misinterpret the extent of island speciation on the Galapagos?; all specimens of a group of birds. What was the relationship between the Galapagos and the South American subcontinent?; 600 miles to the east. What is the complexity of biological interactions on a fully occupied land?; essentially impossible to predict. What is the abundance of unfilled niches on oceanic islands?; high. What does each oceanic island present in terms of adaptation to the environment?; a slightly different solution. What is the duration of evolution on oceanic islands?; known. What is the predictability of the direction of evolution on oceanic islands?; predictable. What did Darwin's experiments on snails and seeds demonstrate?; principles he needed. What did Darwin show about the survival of terrestrial animals in saltwater?; they can form a hard membranous diaphragm. What is the geological origin of the Galapagos Archipelago?; relatively recent volcanic. What was unique about the representation of different kinds of animals and plants on the Galapagos?; peculiar. What is the theory of evolution on inhabitants of oceanic islands?; originated elsewhere. What is the significance of oceanic islands for Darwin's argument?; exemplary natural experiment.