What might the digestive system absorb that the excretory system would have to get rid of?

What kinds of molecules can pass through the cell membrane without any problem?

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.

What are the three groups of atoms that make up amino acids called