What is the stimulus shown in the photographs?

a.
the plant growing toward the light

b.
light coming from a single direction

c.
the trap closing over the insect

d.
the insect touching the trigger hairs

The correct answer is - D. the insect touching the trigger hairs.

On this photos we have an example of an insect and a ''flesh-eating'' plant, where the insect is touching the trigger hairs of the plant's ''mouth'' and the plant quickly closes and traps the insect. All of the plants that have evolved to consume other living organism have a developed system that reacts on touch, so if an insect touches some of the parts of this system, usually a sticky liquid or hairs, it immediately reacts and closes, thus trapping the insect and starting to digest it.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.