Diaphragm...is the muscle that helps in respiration.....there are also some other but....you said flat so diaphragm !
D-cartilage
Cartilages are soft connective tissues which provide flexibility to certain organs. You can feel it by touching you ear pinna that it is hard and flexible but not fleshy.
Hope I answered the question .
One advantage of asexual reproduction is that animals can <span>increase their numbers rapidly. The other options in the question are incorrect and so avoided. The correct option among all the options that are given in the question is the first option or option "A". I hope the answer has helped you.</span>
Sarcoma- 'Sarcoma' means malignant tumour.