It was a little hard but i think the answer is ``Glands`` beacuse i read about Glands and it said that they are ,<span>chemical substances for use in the body or for discharge into the surroundings
Hope this helps <3 </span>
<span>- proteins: 1 gram of protein provides 4 kcal or 17 kJ,
- carbohydrates: 1 gram of carbohydrate brings 4 kcal or 17 kJ,
<span>- lipids: 1 gram of lipid brings 9 kcal or 37 kJ,</span></span>
I'm not 100% sure but I think it's a. Hope that helps.
