What happens is the sun emits millions of waves of UV radiation, which is light particles to us. A wave of this UV radiation or light, takes about 8 minutes to get from the sun to earth, when the UV rays finally gets to earth, it is then filtered through our atmosphere, some light waves get in, but many bounce off.
jumping forward a few steps,
this light or UV radiation, penetrates our skin cells, about a couple inches or so.
the skin cells absorb the light, a similar process is seen by plants as photosynthesis,
and that's how we get a tan....
I hope this helps:)
Exoskeleton and Segmented Bodies and Jointed Appendages and Bilateral Symmetry and <span>Open Circulatory System</span>
Explanation:
- One of the main differences between adult and fetal circulation is <em>the direction and where the non-oxygenated and oxygenated blood circulates</em>. In adults arteries carry oxygenated blood away from the heart and veins carry non-oxygenated blood towards the heart; in fetuses, arteries carry non-oxygenated blood away from the heart and veins carry oxygenated blood back to the heart.
- Another difference is <em>where does the exchange of gases takes place</em>, in fetuses blood is oxygenated in the placenta, in adults in the lungs.
- The circulation between adults and fetuses differs in <em>where does the pressure increases</em>, in adults is on the left side of the heart, in fetuses on the right side.
- Finally,<em> another important difference between adults and fetuses is the presence of shunts</em>, in fetuses these shunts allow both sides of the heart to work parallelly letting mix blood from both ventricles. This shunt gets closed after birth, so adults do not have them.
I hope you find this information useful! Good luck!
The answer is C. silverware as it is the only one of them made in a factory. The other options are all found in nature.
