Which nutritional needs do vegetarians lack​

Vegetarians need to make sure they get enough iron and vitamin B12, and vegans enough calcium, iron and vitamin B12.

Explanation:

Calcium. Vegetarians should consume a variety of calcium sources in order to meet daily requirements.

Iron. Vegetarians should consume a variety of iron sources to meet daily requirements.

Protein. Protein is found in most plant foods as well as animal foods.

Vitamin B.

Vitamin D.

i think she would gain 18 grams

b) the heart is a pump made of muscle and that is difficult to grow in the lab.