Acluster sample is obtained by selecting individuals who are easily contacted or those who voluntarily respond.

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.

If animal agriculture was eliminated, how much grain would become available for human consumption?

What is the primary function of the nervous system?