During a blood drive, shaun noticed that the nurse punctured his vein to connect the tube for withdrawing blood. why is blood obtained through veins and not from arteries when collecting blood? a. veins have lower blood pressure than arteries. b. veins have fewer valves than arteries. c. veins have a larger diameter than arteries. d. veins have more tissue layers than arteries.

Which process can increase the rate of greenhouse gas emissions into the atmosphere in response to a decrease in albedo

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind