In a hypothetical situation, a certain species of flea feeds only on pronghorn antelopes. in rangelands of the western united states, pronghorns and cattle often associate with one another. if some of these fleas develop a strong preference for cattle blood and mate only with other fleas that prefer cattle blood, then over time which of these should occur, if the host mammal can be considered as the fleas' habitat?

1. reproductive isolation
2. sympatric speciation
3. habitat isolation
4. prezygotic barriers

What impact did improvements in farming technology near the end of the nineteenth century have on the american economy? a. more energy was needed to power equipment, creating the renewable energy industry. b. less labor was necessary on farms, leading workers to pursue other jobs. c. less money was invested in farming as many locally owned farms went bankrupt. d. more demand for agricultural products reduced the price of food and animal products.

Me! will give brainliest to whoever answers correctly! arrange the events in peruvian history in chronological order using the numbers 1-6. a. simón bolívar and antonio jóse de sucre’s defeat of spanish forces ensures peru’s independence. b. alejandro toledo is the first indigenous peruvian elected president. c. spanish conquistador francisco pizarro arrives in peru and enslaves peru's indigenous people. d. túpac amaru ii is executed, and his sacrifice inspires peruvians to seek independence and equal rights for indigenous people. e. the chaví­n culture establishes settlements high in the andes. f. attacks by rebel groups threaten democratic rule. (for example, find out the dates of the events (years) and and list them below) you for your time!

From what landforms do most rivers originate ?