Animals with radial symmetry have embryos (blastula) with: A. two germ layers, the ectoderm and the endoderm.
B. no germ layers as they free-form.
C. three germ layers, the ectoderm, the mesoderm and the endoderm.
D. one germ layer.
E. None of these.

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation

In "the pig," what is the main effect that the piglet initially has on kibuka?