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without thought
Consider the energy from sunlight.
To React
yes all living organisms do, it's call adaption
Yes
Irritability
Big Picture answer: Animals are generally distinguished from plants by being unable to synthesize organic molecules from inorganic ones, so that they have to feed on plants or on other animals. They are typically able to move about, although this ability is sometimes restricted to a particular stage in the life cycle. And they are commonly defined as being able to respond quickly to stimuli (though that is somewhat relative). Algae fails to meet these requirements.
yes
To React
Adaptation/Evolution
A bit of algae will have no effect. A huge frond of algae may have some repurcussions on the snails ability to move.
yes all living organisms do, it's call adaption
Sensitivity or stimulant
Stimulus Discrimination?
the ability to respond in a nick of time
excitability
Imunocompetent
irritability
Yes