Carlos set up three full vials beside one another and added drops to see the surface tensions of three different liquids. Which event could be a source of
error?
A. The air temperature varied when someone opened a window.
B. The liquids that spilled over the edges could mix on the table.
C. The vials were made of the same material,
D. The vials were different shapes.

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red.b) the pollen grains will be pure blue.c) the pollen grains will have red interiors and blue exteriors.d) the pollen grains will have blue interiors and red exteriors.

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.

Awolf pack hunts,kills, and feeds on a moose. in this interactions, the moose is a?