Which type of interaction is seen between sea anemone and clown fish?

Two closely related species competing for the same resources cannot coexist indefinitely and the competitively inferior will be eventually eliminated. This principle is known as:

What does Gause's Competitive Exclusion Principle state?

Select the correct option for the following organisms:
$I -$ Copepods,$II -$ Liver fluke,$III -$ Lice,$IV -$ Ticks,$V -$ Ascaris,$VI -$ Cuscuta
Ectoparasites $\quad\quad$ Endoparasites

Identify the figure given below.

Examples of chemicals produced by plants as a defense against grazers and browsers:
$I.$ Nicotine
$II.$ Caffeine
$III.$ Quinine
$IV.$ Strychnine
$V.$ Opium
Choose the correct combination.