pH
b.
salinity
c.
light intensity
d.
all of the above
to sum that unnecessarily long answer up the answer is D.) all of the above
Answer:
biological evolution
Explanation:
B. bone.
C. blood.
D. fat tissue.
Answer:
The correct answer is option A. "skin".
Explanation:
Hair and nails are derived from cells of the skin. The cells of the skin have keratin, a protein that creates a protective barrier against the environmental factors that could affect them. The hair and nails are modifications of skin cells, that have keratin but with additional features. The hair is made of 95% keratin and is formed of three components: medulla, cuticle and cortex. The nail cells are made from keratin as well, forming a horn-like structure that is replaced by skin cells constantly.
Part I
In extension to measuring the amount of light that enters the eye, the pupillary light reflex presents a helpful diagnostic tool. It provides for examining the uprightness of the sensory and motor functions of the eye. if your pupils didn't shut suddenly when abruptly disclosed to light, you'll get a tremendous shot of light (simultaneously with UV rays and other possibly dangerous rays) to your retina, which can severely mess up your vision.
Part II
Without it, we would go blind. If there is not sufficient light and the pupils do not dilate, a small number of light will pass to the retina and the image will be damaged.
b. Capillaries
c. Red blood cells
d. White blood cells