There are 64 codons and 20 amino acids. which of the following is not true?

a. all amino acids are linked to a codon.

b. each amino acid is specified by only one codon.

i think it`s b

Consider the skeleton. which skeletal system is represented by the shaded portion of the skeleton? spongy skeleton compact skeleton axial skeleton appendicular skeleton

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.

In the diagram below, which organelle is a ribosome, which combines amino acids and produces proteins? оооо