All amino acids have a similar structure. which component is responsible for the differences in the 20 amino acids. A the r group

B the carboxylic acid

C the central atom

D the amine group

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy?