Answer:
Stimulus in biology can be defined as an obvious change in either the chemical or physical structure of an organism' environment (either external or internal).
Explanation:
Stimulus in biology can be defined as an obvious change in either the chemical or physical structure of an organism' environment (either external or internal). Thus, all living organisms (both animals and plants) respond to changes in their environment and consequently, an appropriate response or reaction is made. Also, stimulus arising from within the organism is known as internal stimulus while those from its environment are known as the external stimulus.
In organisms, the specialized cells that detect stimulus are generally known as sensory receptors while a group of these receptors is referred to as sense organ. Therefore, the senses are necessary for behavior because stimuli must be sensed in order to respond.
Stimulus control can be defined as a phenomenon that arises when a living organism responds or behaves in the presence of a stimulus and in another way in the absence of a stimulus.
<em>For example, opening the door of a microwave oven as soon as its timer beeps.</em>
<em>Example II; When your body touches a hot object, you quickly move away and feel some pain subsequently. </em>
Unicellular means single cell organism
A class C licence allows you to drive vans and trucks.
A Pensilvania driver licence is valid for 3 years, after u receive thr licence.
A learner permit is valid for 12 months.
Nighttime driving is more demanding then daytime driving for most people.
A learner permit at 17 is good enough for you to drive alone in Pennsylania.
Limited skills is a problem for teenagers, not the main one though.
New residents with a foreign driving licence don't need to apply for a lerner permit.
A valid registration card is necessary.
You can apply for learner's permit no matter how old till the age of 70, afterwoods one would need to pay more attention to the medical exam.
Pennsylvania Graduated Licensing System does not introduce drivers below 16 years to full privileges
If you have good cardio respiratory endurance, then you'll be able to do rigorous physical activity for longer amounts of time, because like other muscles in your body, the more you stretch them the stronger they get and the longer they would last.
Hope that helps and makes sense :)
