Which statement is true? Amino acids form a polypeptide chain via carbon-carbon bonds.
The human body uses 20 amino acids to form all types of proteins.
tRNA is attached to specific proteins in the cell’s cytoplasm.
Amino acids do not need to be assembled in a particular order.

Which process of living things produces water that enters the water cycle

Me the formula cacl2 represents the compound

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?