Which pair is mismatched?

Study the four statements (a-d) given below and select the two correct ones out of them.

(a) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.

(b) Predator starfish Pisaster helps in maintaining the species diversity of some invertebrates.

(c) Predators ultimately lead to the extinction of prey species.

(d) Production of chemicals such as nicotine, strychnine by the plants is a metabolic disorder.

The two correct statements are:

Plants which produce characteristic pneumatophores and show vivipary belong to