Which statement best distinguishes plants and animals as they relate to amino acids? plants can synthesize all twenty amino acids. humans must eat plants or animals to obtain twenty of these amino acids. plants can synthesize all twenty amino acids. humans must eat plants to obtain twelve of these amino acids. plants can only synthesize ten amino acids. humans synthesize the other ten amino acids. plants and humans both synthesize all twenty amino acids. humans must supplement a few of these by eating plants..