It's actually A. Vertebrate have a hard out shell.
Doctors are able to see inside your body without having to cut you open
Polar amino acids tend to be hydrophilic, meaning that they bond to water. These are those that establish hydrogen bonds to water. They are considered polar because they have a R group that's hydrophilic. Because of this characteristic, in a protein they tend to a be a at the surface maintaining contact with the surrounding solutions. The most common polar amino acids are: arginine, lysine, glutamic acid, and aspartic acid.
Answer:
either a or d but not to sure
Explanation:
Answer:
B.
Explanation:
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