Answer:If you were a single-celled organism and you lived in a nutrient-rich place, staying alive would be pretty straightforward. For instance, if you were an amoeba living in a pond, you could absorb nutrients straight from your environment. The oxygen you would need for metabolism could diffuse in across your cell membrane, and carbon dioxide and other wastes could diffuse out. When the time came to reproduce, you could just divide yourself in two!
However, odds are you are not an amoeba—given that you're using Khan Academy right now—and things aren’t quite so simple for big, many-celled organisms like human beings. Your complex body has over 30 trillion cells, and most of those cells aren’t in direct contact with the external environment.^1
1
start superscript, 1, end superscript A cell deep inside your body—in one of your bones, say, or in your liver—can’t get the nutrients or oxygen it needs directly from the environment.
How, then, does the body nourish its cells and keep itself running? Let's take a closer look at how the organization of your amazing body makes this possible.
Explanation:
the answer is b: blinking when light is flashed in the eyes
It is the excretory system
Methanol is highly toxicicated and a lot of people have
become blind or died from drinking it. Ethanol, or ethyl alcohol, is the
alcohol associated with "alcoholic" beverages. The yeast cells obtain
energy from enzyme-catalyzed reactions that convert sugar or starch to ethanol
and CO2. C6H12O6(aq) ---->2
CH3CH2OH(aq) + 2 CO2(g)
The most common visible sign that could indicate that Michelle has an iodine deficiency<span> would be a goiter. A goiter is an enlargement of the thyroid gland that makes a </span>visible<span> bump in the neck. 2.</span>