Which type of nutrition is present in tapeworm?

Plants have low energy needs as compared to animals. Explain.

Mention the major events during photosynthesis.

What is the functional difference between the four chambers of the heart?

$(a)$ Explain why multicellular organisms need a transportation system for carrying food and oxygen.
$(b)$ Why does an organism require an excretory system?

Which is the first enzyme to mix with food in the digestive tract?