Cholesterol, testosterone, and estrogen are
all examples of which are chemical
messengers that the body uses.
A. sugars
B. steroids
C. proteins

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.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Which best describes carbon dioxide’s path out of the body