What is the significance of emulsification of fats?

What are the common features of the respiratory organs in aquatic and terrestrial animals?

Which of the following statement$(s)$ is (are) true about respiration?
$(i)$ During inhalation,ribs move inward and diaphragm is raised
$(ii)$ In the alveoli,exchange of gases takes place i.e.,oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
$(iii)$ Haemoglobin has greater affinity for carbon dioxide than oxygen
$(iv)$ Alveoli increase surface area for exchange of gases

Explain how the human body responds when adrenaline is secreted into the blood.

What would happen if green plants disappear from the earth?

After a vigorous exercise,you may experience cramps in your leg muscles. Why does this happen?