From where do the placenta and umbilical cord develop? outer cells of the blastocyst
inner cells of the blastocyst
directly from the uterus
directly from the ovary

Ya um forget the human body let’s give our students “ s 3 x e d “

Which flexible structure that supports the nerve cord and led to the backbone

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.

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d