18. The heads of phospholipids are while the tails are
1 point
Polar... Nonpolar
Nonpolar...polar
hydrophobic...hydrophilic
O uncharged...ionic

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

Which animal is a producer in this ecosystem

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel