Iam the vanishing gland. you need me most during your early childhood years and i begin to disappear when you reach puberty. i am considered a member of both the endocrine and the lymphatic system. i secrete a hormone, which to stimulate lymphoid cells to produce t-cells. you need me to fight off diseases. who am i?

Four types of motile cells in human body?

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.

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.