I believe it is C) calcium-rich plates echinoderms and B) bones in mammals like vertebral
The process of a solid turning directly into a gas is known as "sublimation"
Ans.
There are twenty amino acids that take part in protein synthesis. These amino acids act as precursor for all protein molecules and are known as essential amino acids. Plants can synthesize all twenty amino acids from simple precursors, while animals can make only twelve amino acids. Animals obtain remaining eight amino acids by eating plants.
Thus, the correct answer is 'option) D.'
