What is the difference between an artery and a vein?

Group of answer choices

An artery carries blood away from the heart; a vein carries blood to the heart.

An artery is responsible for carrying blood; a vein is responsible for gas exchange.

An artery is responsible for gas exchange; a vein is responsible for carrying blood.

An artery carries blood to the heart; a vein carries blood away from the heart.

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

What type of cell is produced after fertilization occurs and the gametes combines ?

2. which is the last step in the scientific method?