Which of these models would best represent the Big Bang Theory? burst an inflated balloon with a pin
blow a balloon with spots marked on it
press a piece of raisin bread in the palm
keep a raisin bread in the open for a week

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Pulmonary arteries carry highly oxygenated blood. true or false?