The answer would be D I know this cause I took the same test heheh :)
It's the stimulus because that's what triggers the salivation which is the reaction
Answer:
Plants from this group have well-developed roots, stem and leaves and separate tissues for conduction of food and water .But ,they do not bear flowers and fruits.They reproduce with the help of spores formed along the bach or posterior surface of their leaves.Examples : Nephrolepis,Marsilea,Adiantum, Equisetum, Lycopodium, Selaginella,etc.
These plans reproduce asexually by spore-formation and sexuall by zygote formation.They have a well-developed conducting system.
Explanation:
hope this helps!
The tentacles provide the fish with shelter from predators.
