Which ecosystem is more stable?

In a food chain,humans cannot be placed in which of the following trophic levels?

Which of the following statements are correct?
$(a)$ Energy flow from producers to consumers is unidirectional
$(b)$ Energy pyramid can never be inverted
$(c)$ Transfer of energy follows the $10\%$ law
Choose the correct answer from the options given below:

Select the incorrect statement from the following.

When a peacock eats a snake,which eats insects,and insects feed on green plants,the peacock is a/an:

Water plants provide ....... to water animals.